Isaac Bell — Chief Investigator.
Joseph Van Dorn — The “Boss.”
Harry Warren — Chief of Van Dorn Gang Squad, born Salvatore Guaragna, alias Broadway theater sceneshifter Quinn, Isaac Bell confidant.
Grady Forrer — Head of Research.
Archibald Angell Abbott IV — New York blue blood, former actor, Isaac Bell’s best friend since they fought a college boxing match.
Helen Mills — Isaac Bell’s protégée, daughter of U.S. Army Brigadier G. Tannenbaum Mills, first woman detective in the agency.
James Dashwood — Sharpshooter, Isaac Bell protégé.
“Kansas City” Eddie Edwards — Railroad protection specialist.
Texas Walt Hatfield — Former Texas Ranger and Van Dorn private detective turned Western movie cowboy.
Scudder Smith — Former newspaperman masquerading as inebriated New York Evening Sun reporter.
Eddie Tobin — Gang Squad harbor pirate specialist.
Horace Bronson — San Francisco.
Tim Holian — Los Angeles.
Charlie Post — Denver.
Jerry Sedgwick — Cincinnati.
Captain “Honest Mike” Coligney — Commands New York Police Department 19th Precinct serving the Tenderloin and the Theater District.
Nick Sayers — Handsome proprietor of Grove Mansion, a bordello known as the “Ritz of the Tenderloin.”
Skinner — Two-hundred-and-fifty-pound doorman of the “Ritz of the Tenderloin.”
Neil Nyren — Bordello procurer, twinkly-eyed proprietor of perfume shop in Grand Central Terminal.
Gophers — West Side gangsters.
Adolph Klauber — New York Times drama critic.
Mrs. Shine — Proprietress of Mrs. Shine’s Boarding House for Actors, Anna Waterbury’s landlady.
Heather and Lou — Dancers residing at Mrs. Shine’s.
Jackson Barrett — Actor-impresario, matinee idol, and writer who trades the title roles of Dr. Jekyll and Mr. Hyde in his modernized version of the melodrama based on the Robert Louis Stevenson novella.
John Buchanan — Actor-impresario, matinee idol, and the business brains of the Barrett & Buchanan Theater Company, trades Jekyll and Hyde title roles with Jackson Barrett, his near twin.
Isabella Cook — “Great and Beloved” leading-lady Broadway actress, plays beautiful heiress Gabriella Utterson.
Henry Booker Young — Barrett & Buchanan’s long-serving, long-suffering stage manager.
The publicist
Jeff and Joe Deaver — Wealthy brothers, “angels” who invest in Broadway shows.
Miss Gold — General businesswoman-actress, ticket shill.
Rick L. Cox — Playwright, embittered ghostwriter.
Mr. Vietor — Star.
Douglas Lockwood — Plays Detective Doyle.
Lucy Balant — General businesswoman-actress, Anna Waterbury’s roommate in Mrs. Shine’s Boarding House for Actors.
Ned Stewart — Head carpenter.
Stage Manager
Joel Wallace — Chief of Van Dorn London field office.
Scotland Yard inspector
Scotland Yard detectives and constables — Active and retired.
Nigel Roberts — Retired Scotland Yard detective, curator of the British Lock Museum.
Davy Collins — Tonsorial practitioner with barbershop in Whitechapel.
Wayne Barlowe — London newspaper illustrator and artist.
London Emily — Manchester laudanum addict, crucial witness.
Lord Strone — British Military Intelligence, Secret Service Bureau.
Abbington-Westlake — British Admiralty, Naval Intelligence, Foreign Division.
Reginald — Espionage shadow.
James Mapes — Actor, Garrick Club member.
Granger — Cruel critic.
Dolly — West End chorus girl, Detective Joel Wallace’s new friend.
Dolly’s mother — Former dancer in Tra-la-la Tosca.
Marion Morgan Bell — Isaac Bell’s bride of one year, his beloved confidante, well-known filmmaker.
Mrs. Rennegal — Rough-and-ready Cooper Hewitt lighting designer and operator.
Mr. Davidson — Camera operator.
Kellan — Davidson’s assistant.
Mr. Blitzer — Camera operator.
Medick — Actor-impresario, owned previous tour of Dr. Jekyll and Mr. Hyde.
Rufus S. Oppenheim — Theatrical Syndicate boss, Isabella Cook’s husband.
Preston Whiteway — San Francisco newspaper publisher and Marion Morgan Bell’s boss for Picture World News Reels.
Kux — Isaac Bell’s taciturn private car conductor.
Uncle Andy Rubenoff — Wall Street banker gone to Hollywood.
Hazel Bradford — “Billboard in the sky” airplane pilot.
Jimmy Richards, Marvyn Gordon, and Molly — Staten Island wharf rats.
Coroners, assistant coroners, stage door tenders, theater callboys, stagehands, newspapermen and — women, company cops, locomotive engineer and fireman, apprentice Van Dorn detectives
Anna Genevieve Pape — Stagestruck eighteen-year-old who ran away from home to be an actress. Stage name: Anna Waterbury.
William Lathrop Pape — Anna’s father, a Waterbury industrialist.
Lillian Lent — Boston prostitute.
Mary Beth Winthrop — Springfield, Massachusetts, Christ Church choir soprano.
Beatrice Edmond — Cincinnati continuous vaudeville dancer.
Countless women — Actresses, girls of the street, factory workers, Western dance hall girls, a doctor’s wife, a banker’s wife, a librarian, and others.