As The Core’s true purpose is revealed, the Hardy Boys and their friends must band together to save themselves, and the world, from an unheard-of technology that could forever change…

The gang races to stop a potential bombing at the Demon Day Parade, while Fenton makes a shocking discovery of his own.

Joe conspires with J.B. to steal the relic from Stratemeyer Global and get the power out of Frank, but The Eye has other plans.

When the gang learns the location of George Estabrook’s hidden Codexes, they must enlist the help of an unlikely ally to retrieve them before anyone else.

Joe suspects Dennis’s girlfriend, Lucy, is hiding something about the night he went missing, and Frank realizes The Eye is trying to show him something about the case.

The gang joins Callie at Rosegrave with hopes of saving Frank, but they’ll require the help of an old foe and The Power of The Eye.

When Frank is led to believe a local recluse is their prime suspect, the team attempts a risky break-in to retrieve the video camera Dennis lost in the woods.

After a shocking blow, the gang must divide and conquer to determine the identity of Deep Voice and get The Core back.