When Mr. Hardy disappears while investigating a mystery surrounding a vacant house rumored to be either haunted or an abode for criminals, Joe and Frank search for the truth.

When the Hardy Boys set out to solve the mystery of their missing chums, they discover a gang hide-out in a cave on an island along the way.

Frank and Joe solve a mystery involving the disappearance of a professor, a hot-tempered hermit, sabotage at the station, and the Honeycomb Caves.

Detective brothers Frank and Joe try to figure out who's spoiling the fun on a class trip in the third book in an all-new, interactive Hardy Boys chapter book mystery series. Frank and Joe Hardy are super-psyched for their school trip to Lake Poketoe. Along with their friends, they can't wait to go tubing, make s'mores, and take nature walks. And Joe is particularly excited to try out his brand-new water skis during the trip! But when the group tries...