Frank and Joe Hardy are undercover agents for the American Teens Against Crime organization and are assigned to investigate the sabotaging of an extreme sports meet in Philadelphia.
Frank and Joe's investigation of the theft of valuable antique weathervanes and their father's search for a missing Navy employee and top secret documents intertwine.
When a ferocious, wolf-like creature appears in a small town, the Hardy boys are hired to clear the name of a young man who has a history of werewolves in his family.
A Japanese business tycoon mysteriously disappears and, soon after, a rare Samurai sword is stolen from an art gallery. Suspecting a connection, the Hardy boys try to solve the mystery.
Joe and Frank Hardy travel to Egypt to investigate the theft of five priceless Egyptian statuettes stolen from a New York museum and are asked to guard a mysterious mummy en route.
Frank and Joe Hardy plan to compete in the local arcade tournament, agreeing the winner will get to move into the cool new room built by their dad, and when money goes missing from the competition, they work together to solve the mystery.
Eight-year-old detectives Frank and Joe Hardy work together help their teammate find his missing baseball mitt before the last game of their little league season.
The Hardy boys try to prevent cheating at a Halloween mystery contest, sponsored by Bayport's Merchant Association, that promises big prizes to the winners.
