Research Holp

Notes on the first 15 books are taken from the Random House re-issued reprints.
Any other editions used will be listed with the book title.
Major characters are the 7 BWGs. Minor characters are…anybody else.
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Updated
mansion 1.The Secret of the Mansion
Major Characters: Trixie, Honey, and Jim.
Minor Characters: Mr. Peter Belden, Mrs. Helen Belden, Bobby, Miss Trask, Regan, Mr. Lytell, Jonesy (bad guy), Mr. Rainsford.
Characters referred to: Mr. & Mrs. Frayne, Uncle James Frayne & Aunt Nell, Mart, Brian, Miss Lefferts, Mr. & Mrs. Wheeler.
Where did they go? They stay in Sleepyside.
red trailer 2.The Red Trailer Mystery
Major Characters: Trixie, Honey, and Jim.
Minor Characters: Mr. & Mrs. Belden, Bobby, Miss Trask, Regan, Mr. & Mrs. Darnell, Sally & Joeanne, Jeff & Al (bad guys), Ben Ryker, Nat Smith, Mary Smith, Mr. Rainsford.
Characters referred to: Mart, Brian, Mrs. Green, Mr. Lynch.
Where did they go? The farming district far upstate--Autoville, Pine Hollow Camp, Wilson Ranch, Rushkill Farms.
gatehouse 3.The Gatehouse Mystery
Major Characters: Trixie, Honey, Jim, Mart, & Brian.
Minor Characters: Bobby, Miss Trask, Regan, Celia, Nailor, Dapper Dick (bad guy), Mr. Belden, Tom Delanoy.
Characters referred to: Jed Tomlin, Cook, Mr. Frayne, Mr. Lytell, Louie (Dick's partner).
Where did they go? They stay in Sleepyside.
mysterious visitor 4.The Mysterious Visitor
Major Characters: Trixie, Honey, Jim, Mart, Brian, & Di.
Minor Characters: Bobby, Mr. & Mrs. Belden, Miss Trask, Regan, Uncle Monty Wilson/Tilney Britten (bad guy), Tom, Celia, Olyfant, Harrison, Mr. Lynch, Mrs. Lynch, Miss Golden, Spider Webster, Sgt. Molinson.
Characters referred to: Jonesy, Aunt Alicia, Ty Scott.
Where did they go? They stay in Sleepyside.
glen road 5.The Mystery off Glen Road
Major Characters: Trixie, Honey, Jim, Mart, Brian, & Di.
Minor Characters: Bobby, Fleagle, Miss Trask, Mr. & Mrs. Belden, Mr. Lytell, Ben Ryker, Regan, Mr. Maypenny.
Characters referred to: Mr. & Mrs. Wheeler, Aunt Alicia.
Where did they go? They stay in Sleepyside.
arizona 6.The Mystery in Arizona
Major Characters: Trixie, Honey, Jim, Mart, Brian, & Di.
Minor Characters: Bobby, Mr. & Mrs. Belden, Miss Trask, Barbara Slater, Tom, Mr. Lynch, Uncle Monty, the Orlandos, Maria, Rosita & Pedro, Miss Girard, Lionel "Tenny" Stetson, Jane Brown, Mrs. Sherman, Mr. Wellington, Sally, Bob, & Billy Wellington,
Characters referred to: Mrs. Lynch, Mr. Wheeler, Foreman Howie.
Where did they go? They go to an Tucson, Arizona dude ranch.
mysterious code 7.The Mysterious Code
Major Characters: Trixie, Honey, Jim, Mart, Brian, & Di.
Minor Characters: Mr. Stratton, Spider & Tad Webster, Mrs. Wheeler, Sgt. Molinson, Mrs. Spencer, Mr. & Mrs. Belden, Bobby, Larry & Terry Lynch, Mrs. Vanderpoel, Brom Vanderheidenbeck,  Regan, Hakaito brothers, Bull & Snipe Thompson (bad guys), Tom & Celia.
Characters referred to: Jonesy, Uncle Jim, Aunt Nell, Mrs. Bruger
Where did they go? They stay in Sleepyside.
black jacket 8.The Black Jacket Mystery
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Bobby, Regan, Mr. & Mrs. Belden, Judge Armen, Mr. Maypenny, Mr. Lytell, Luke (bad guy), Dolores & Lupe Perez.
Characters referred to: Miss Elliman, Police Chief Moran, Doc Tremaine, Tim Mangan.
Where did they go? They stay in Sleepyside.
happy valley 9.The Happy Valley Mystery
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Hank & Mary Gorman, Ben, Ned Schulz, Dot Murray, Bob & Barbara Hubbell, Mrs. Schulz, Sheriff Brown, Jake Burton & Rancy Miller (bad guys).
Characters referred to: Uncle Andrew Belden
Where did they go? They go to Iowa.
marshland 10.The Marshland Mystery
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Gaye Hunya, Mr. & Mrs. Belden, Bobby, Regan, Paul Trent, Sgt. Rooney, Rachel Martin, Della Crandell, Miss Trask, Regan,
Characters referred to: Miss Bennet, Mike the gardner, Mr. & Mrs. Wheeler.
Where did they go? They stay in Sleepyside.
bob-white cave 11.The Mystery at Bob-White Cave
Major Characters: Trixie, Honey, Jim, Mart, Brian, & Di.
Minor Characters: Uncle Andrew, Linnie Moore, Matthew & Annie Moore, Slim Sanderson (bad guy), Bill Hawkins, Sam Owens, Mr. Glendenning.
Characters referred to: Dan, Aunt Helen & Uncle Mart.
Where did they go? They go to Missouri.
blinking eye 12.The Mystery of the Blinking Eye
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Bob & Barbara Hubbell, Ned Schulz, Miss Trask, Mexican lady, Betsy Tucker, Mr. Meredith, Dr. Joe & Betty Reed, Tex, Chris, Jeff, & Nancy Reed, Evalinda, Blinky, Big Tony & Pedro (bad guys), Mr. Wheeler.
Characters referred to: Sally, Billy, and Bob Wellington.
Where did they go? They go to New York City.
cobbett's island 13.The Mystery on Cobbett's Island
Major Characters: Trixie, Honey, Jim, Mart, Brian, & Di.
Minor Characters: Mr. & Mrs. Belden, Miss Trask, Tom & Celia Delanoy, Bobby, Elmer Thomas, Dr. Holmes, Peter Kimball, Mr. & Mrs. Kimball, Abe White, Cap, Captain Price, Captain Clark, Slim Novarski (bad guy), Mrs. Ethel Hall, young Ed Hall.
Characters referred to: Mr. & Mrs. Wheeler, Mr. Lawlor, Dan, Mr. Maypenny, Regan, Uncle Andrew, Ed Hall, Brad Cummings.
Where did they go? They go to Cobbett's Island.
emeralds 14.The Mystery of the Emeralds
Major Characters: Trixie, Honey, Jim, Mart, Brian, & Di.
Minor Characters: Mr. & Mrs. Belden, Bobby, Mr. Lytell, Julie Sunderland, Neil, Mr. & Mrs. Lynch, Lizzie James, Jenkins (bad guy), Edgar Carver, Mr. & Mrs. Sellers, Alexander Brandon, Carolyn Bates.
Characters referred to: Dan, Chuck Altemus, Helen Sunderland, Jonathan Carver, Charles & Ruth Fields.
Where did they go? They go to Virginia.
mississippi 15.The Mystery on the Mississippi
Major Characters: Trixie, Honey, Jim, Mart, Brian, & Dan.
Minor Characters: Mr. Wheeler, Mr. Brandio, Pierre Lontard/Diego Martinez (bad guy), Captain Martin, Elena & Juan Aguilera, Paul, Lem Watkins, Bob, Leighton Ogilvie, Mike & Dave.
Characters referred to: Di, Miss Trask, Mr. & Mrs. Thompson.
Where did they go? They go to St. Louis.
missing heiress 16.The Mystery of the Missing Heiress (Short and Ugly)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Tom Delanoy, Regan, Bobby, Mr. & Mrs. Belden, Larry & Jerry, Mrs. Vanderpoel, Mrs. Hendricks, Janie/Juliana Maadsen, Mr. Wheeler, Beth Meredith, Spider Webster, Sgt. Molinson, Jones (bad guy), Juliana/Jones's niece (bad girl), Hans Vorwald.
Characters referred to: Betje & Wilhelm Maadsen, Dr. Morrison, Minna Schimmel, Mrs. Walter De Jong, Snipe & Bull Thompson.
Where did they go? They stay in Sleepyside, except for a quick trip to Lakeside, Illinois.
uninvited guest 17.The Mystery of the Uninvited Guest (Cream Oval)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Hallie Belden, Mr. & Mrs. Belden, Bobby, Miss Trask, Mr. Lytell, Mr. & Mrs. Wheeler, Mr. & Mrs. Lynch, Harrison, Oliver Tolliver (bad guy), Juliana Maadsen, Hans Vorwald, Mrs. Vanderpoel, Regan, Ella Kline, Mrs. Boyer, Dick Ryks (bad guy).
Characters referred to: Harold Belden, Knut & Cap Belden,
Where did they go? They stay in Sleepyside.
phantom grasshopper 18.The Mystery of the Phantom Grasshopper (Cream Oval)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters:
Characters referred to:
Where did they go? They stay in Sleepyside.
unseen treasure 19.The Secret of the Unseen Treasure (Cream Oval)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters:
Characters referred to:
Where did they go? They stay in Sleepyside.
telegraph road 20.The Mystery Off Old Telegraph Road (Cream Oval)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters:
Characters referred to:
Where did they go? They stay in Sleepyside.
castaway children 21.The Mystery of the Castaway Children (Cream Oval)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters:
Characters referred to:
Where did they go? They stay in Sleepyside.
mead's mountain 22.Mystery at Mead's Mountain (Cream Oval)
Major Characters:
Minor Characters:
Characters referred to: Mr. Crider
Where did they go? They go to Vermont.
queen's necklace 23.The Mystery of the Queen's Necklace (Cream Oval)
Major Characters:
Minor Characters:
Characters referred to:
Where did they go? They go to England.
saratoga 24.The Mystery at Saratoga (Cream Oval)
Major Characters:
Minor Characters:
Characters referred to:
Where did they go? They go to Saratoga.
sasquatch 25.The Sasquatch Mystery (Cream Oval)
Major Characters:
Minor Characters:
Characters referred to:
Where did they go? They go to Idaho.
headless horseman 26.The Mystery of the Headless Horseman (Cream Oval)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters:
Characters referred to:
Where did they go? They stay in Sleepyside.
ghostly galleon 27.The Mystery of the Ghostly Galleon (Cream Oval)
Major Characters:
Minor Characters:
Characters referred to:
Where did they go? They go to Pirate's Point, specifically the Catskill Mountains.
hudson river 28.The Hudson River Mystery (Cream Oval)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters:
Characters referred to:
Where did they go? They stay in Sleepyside.
velvet gown 29.The Mystery of the Velvet Gown (Cream Oval)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters:
Characters referred to:
Where did they go? They stay in Sleepyside.
midnight marauder 30.The Mystery of the Midnight Marauder (Cream Oval Library Binding)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Miss Trask, Regan, Tom, Celia, Mrs. Belden, Mr. Stratton, Lester Mundy, Vera Parker, Margo Birch (bad girl), Grandpa Crimper, Earl "Sonny" Crimper, Jr., Sgt. Molinson.
Characters referred to: Mr. Zimmerman, Ruthie Kettner, Shrimpy Davis, Marvin Easton.
Where did they go? They stay in Sleepyside.
maypenny's 31.The Mystery at Maypenny's (Cream Oval)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Mr. Maypenny, Mr. & Mrs. Belden, Mr. Wheeler, David Maypenny, John Score, Mr. McLane, Mark Nelson, Todd Maurer, Jim VerDoorn, George Gemlo, Lawrence Howard (bad guy), Sgt. Molinson.
Characters referred to: Mr. & Mrs. Renfer,
Where did they go? They stay in Sleepyside.
whispering witch 32.The Mystery of the Whispering Witch (Cream Oval)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Bobby, Fay Franklin, Mrs. Franklin, Zeke Collins, Lewis Gregory (bad guy), Paul Trent, Dr. Ferris, Ed Gaffey, Simon Hunter (assistant bad guy).
Characters referred to: Sarah Sligo, Caleb Lisgard, Mariellen Hanrahan, Mr. Larson.
Where did they go? They stay in Sleepyside.
vanishing victim 33.The Mystery of the Vanishing Victim (Cream Oval)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Bobby, Mr. & Mrs. Belden, Mr. Burnside, Henry Meiser, Eileen, Melissa, Mrs. Manning, Glenda Maurer, Sgt. Molinson, Andy Kowalski (bad guy).
Characters referred to: Mr. Maypenny
Where did they go? They stay in Sleepyside.
missing millionaire 34.The Mystery of the Missing Millionaire (Cream Oval Library Binding)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Mr. Lytell, Bobby, Mr.  & Mrs. Belden, Miss Trask, Laura Ramsey (bad girl), Mark McGraw (bad guy), Sgt. Molinson, Burt Anderson.
Characters referred to: Anthony Ramsey, Frank Riebe, Esther.
Where did they go? They stay in Sleepyside.
fire 35.The Mystery of the Memorial Day Fire (Square)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Nick Roberts, Mr. Roberts, Jane Dix-Strauss, James D. Slettom (bad guy), Bobby, Mr. & Mrs. Belden, Sgt. Molinson, Pat Murphy, Miss Trask.
Characters referred to: Celia, Bruce Becker, Jan Carlson.
Where did they go? They stay in Sleepyside.
doll 36.The Mystery of the Antique Doll (Square)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Bobby, Mr. & Mrs. Belden, Dr. Ferris, Mrs. De Keyser, Carl Reid (bad guy), Miss, Trask, Mrs. Wheeler, André (assistant bad guy), Inspector Marcel Patou, Sgt. Molinson.
Characters referred to: Mr. Wheeler
Where did they go? Trixie and Honey go to Paris.
pet 37.The Pet Show Mystery (Square)
Major Characters: Trixie, Honey, Jim, Mart, Brian, Di, Dan.
Minor Characters: Mrs. Belden, Norma Nelson, Dr. Chang, Miss von Trammel, Scott Hopper, Paul Gale (bad guy), David Llewelyn, Bobby, Gordon Halvorson.
Characters referred to: Mr. Johnson, Sgt. Molinson.
Where did they go? They stay in Sleepyside.
indian 38.The Indian Burial Ground Mystery (Square)
Major Characters: Trixie, Honey, Mart, Brian, Di, Dan.
Minor Characters: Bobby, Mr. & Mrs. Wheeler, Professor Conroy (bad guy), Charles Miller, Harry Kemp (bad guy), Mr. & Mrs. Belden, Mrs. Beales, Jake Hanson, Mrs. Fields, Brom, Miss Trask, Regan, Sgt. Molinson.
Characters referred to: Jim, Miss Wilson, Mrs. De Keyser.
Where did they go? They stay in Sleepyside.
galloping ghost 39.The Mystery of the Galloping Ghost (Square)
Major Characters: Trixie & Honey
Minor Characters: Regan, Bill & Charlene Murrow, Pat Murrow, Gustav, Jon Burke (bad guy), Wilhelmina James, Lars Anderson, Mark Onsgard, Courtney Dahl.
Characters referred to: Mr. & Mrs. Belden, Mr. Wheeler, Brian, Mart, & Bobby, Jim, Di, Dan, Gunnar Bjorkland.
Where did they go? They go to Minnesota.