Regular Characters
- Phil Cohen
- Chief Collig
- Jerry Gilroy
- Fenton Hardy
- Frank Hardy
- Joe Hardy
- Laura Hardy
- Biff Hooper
- Chet Morton
- Iola Morton
- Mr. Morton
- Mrs. Morton
- Tony Prito
- Con Riley
- Callie Shaw
- Oscar Smuff
Other Characters
- Adelia Applegate, sister of Hurd and fellow occupant of Applegate Mansion
- Hurd Applegate, occupant of Applegate Mansion
- Major Applegate, builder of Applegate Mansion (mentioned only)
- Henry J. Brown, a tourist from New York
- Launcelot Gobbo (mentioned only)
- Mike Halley, railroad flagman
- Ike Harrity, Bayport ferryboat's ticket seller
- John "Red" Jackley, an ex-con from New York
- Hobo Johnny, a homeless man from Cherryville
- Jake, the station agent
- Kauffman, an expert wigmaker
- Harold Morley, a Skakespearean actor
- Henry Robinson, caretaker of Applegate Mansion
- Mrs. Robinson, Henry's wife
- Paula Robinson, Henry's daughter and Tessie's twin
- Perry "Slim" Robinson, Henry's son and friend of the Hardys
- Tessie Robinson, Henry's daughter and Paula's twin
- Mr. Rocco, fruit store owner
- Rosa Rocco (mentioned only)
- Melvin Schuster, a former Bayport High student (mentioned only)
- Mr. Schwartz, costume shop owner
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Locations
- Albany
- Bayport
- Bayport High
- Bayport Police Station
- Bayport railroad station
- Elm Street
- The Hardy home
- Main Street
- Market Street
- The Morton farm
- Pine Street
- Renshaw Avenue
- The Shaw home
- Tower Mansion
- Cherryville
- Ducksworth
- New York City
- Thornton (mentioned only)
- Willow Grove
- Willowville (mentioned only)
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