Frank and Callie look behind the veil at Rosegrave Prep and learn that Laura's investigation started in high school, while Joe tries to prove their conspiracy has a local police connection.

The boys head back to school, but Frank and Callie have different takes on the new girl. Frank learns more about young Laura, while an old friend returns to offer Joe information...for a price.

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.

Taking a step farther than their mother did and learning the nature of the object at the heart of the mystery, Frank and Joe's unity fractures over what to do next. Tensions between Chet, Callie, Frank and Stacy reach a peak.

Trapped and lost, Biff and Joe’s friendship is tested. Frank can only help find them by revealing too much to people he can’t trust.

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?