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.

A terrifying man tracks Joe to the carnival, where a curious new trinket grants Joe incredible luck. Frank tries to find out why Laura was so interested in a decades-old local mine collapse.

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?