Frank and Joe Hardy move to the small town of Bridgeport for the summer and set out to uncover the truth behind a recent family tragedy.

Fenton leaves town to search for the missing Rupert Khan. Joe delivers a message for a shady stranger, and Frank connects Laura to a local legend and a mysterious object pulled from the sea.

Frank and Callie grow closer during an entrance exam to a prestigious school, only to find more secrets. Joe and Biff decide to hide his lucky charm from a threatening pursuer. Fenton takes another step in his search.

Frank and Joe exchange truths with their Grandmother and find a long-hidden secret in her home. Fenton finds what he's looking for. Meanwhile, other forces work against them all.

Regaining possession of something long-lost, Gloria reasserts old power. Fenton returns and is stunned to see his sons in the middle of secrets that he, too, has uncovered. Frank enters an uneasy alliance, and climactic events are set in motion.

The Hardy boys and the gang embark on a daring mission to finally uncover the truth… but in revealing the truth could they unleash a dark power beyond their control?