Frank Hardy: Dark hair, dark eyes, 6 foot one tall. Older brother of Joe Hardy, more serious, but will take risks. Eldest son of Fenton and Laura Hardy. Callie Shaw's boyfriend.
Joe Hardy: Curly blond hair, blue eyes, 6 foot tall. Younger brother of Frank Hardy and more impulsive, but always dependable. Youngest son of Fenton and Laura Hardy. Iola Morton's boyfriend.
Callie Shaw: Blond hair, brown eyes. Frank Hardy's girlfriend.
Iola Morton: Dark hair, blue eyes. Joe Hardy's girlfriend and Chet Morton's sister.
Fenton Hardy: Frank and Joe's detective father. Laura Hardy's husband. Gertrude Hardy's brother. Tall, dark, athletic. A very talented private investigator, he previously served as a detective in the NYPD with much success.
Phil Cohen: One of the Hardys' best friends. Athletic, computer genius.
Chet Morton: One of the Hardys' best friends. Iola Morton's brother. Loves to try various hobbies, which often helps with the mystery.
Biff Hooper: Tall, muscular, blond, one of the Hardys' best friends.
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