Brothers Frank and Joe Hardy and their elementary school friends help them track down what they hope is a treasure after they find a mysterious map.

While attending an amusement park under the new ownership of their friend Daisy, Joe and Frank investigate the disappearance of a patron who was last seen riding a hit attraction, an event that has threatened Daisy's family's livelihood.

Right before the final game of the Little League season, the Bayport Bandits' lucky charm--Jason's mitt--goes missing! The team is devastated. Can Frank and Joe solve the case of the missing mitt before the Bandits lose the game?

Looking forward to seeing their favorite band at Bayport's Battle of the Bands, Frank and Joe Hardy are on the case when a bass guitar belonging to one of the band members goes missing, a situation that compromises the group's standing in the competition.

Valuable electronic parts containing platinum are being stolen from shipments made by Stanwide Mining Equipment Company's cargo planes, and Frank and Joe Hardy are called upon to assist their world-renowned detective father in solving the case.

"When the popular comics character Morpho the Morph Monster comes to Bayport for a fan event, everyone is excited, including Frank and his brother, Joe! Morpho is also bringing his very important Morph Spork--a special tool that helps him eat people's brains. But right before the event is about to start, Morpho's Spork goes missing!"--P. [4] of cover.

Frank and Joe bring their detective skills to the athletic arena in this all-new Hardy Boys Secret Files mystery!It's time for Field Day at Bayport Elementary and all the kids are excited! Whatever grade wins gets a pizza party, and the person with the highest personal score also gets a special prize. But when the field equipment is sabotaged the day before the events are supposed to start, it looks like Field Day might not happen after all--unless...