Valuable antique weathervanes are being stolen in the Pennsylvania Dutch country. A Navy employee removes a top secret document from the Pentagon. The Hardy brothers try to solve these two seemingly unrelated mysteries.

The search for missing gold takes the Hardy boys to the Yucatán Peninsula where they uncover a second mystery.

Something is amiss in Bayport, the Hardy boys' home town. One by one, Frank and Joe tackle the clues.

SOMETHING ROTTEN IS LURKING AT THIS RANCH! It's winter in Bayport, but things are heating up at the Morton family farm. It looks like someone is wreaking havoc with the property, and Chet and Iola Morton are worried that their grandparents are in danger of losing it! With their parents out of reach, the Mortons call on Frank and Joe Hardy for help. They need to figure out who's behind the trouble-and fast. The Hardys are hot on the trail, but...

"Frank and Joe are on a mission to track down a thief in the first book in an all-new, interactive Hardy Boys chapter book mystery series. Includes space for readers to jot down their own ideas and solutions to the case! Bayport Elementary is throwing a fundraiser so they can go on an end-of-the-year trip. Ellie Freeman's parents have volunteered their house for the event, and neighbors have donated all sorts of prizes to be raffled off including...

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...