Jake, a 14-year-old gadget whiz, didn't plan on a summer full of treasure, thieves, and danger. He just got lucky. While in Ireland on a class trip, Jake stumbles upon the first clue to a treasure missing from the Spanish Armada. Jake sees the riches as his chance to buy back the family sailboat and restore a piece of the life he enjoyed before his father was critically injured in an accident. Desperate to find the treasure, Jake teams up with Zach, his nemesis and class bully, and two girls in a clue-hunting chase across the Dingle Peninsula. Dodging would-be thieves, exchanging wisecracks with Zach, and concocting ingenious devices to get them out of scrapes, Jake leads the team as they connect piece after piece to the more than 400-year-old mystery.