Twelve-year-old twins Lucy and Paddy Hendricks think they're in for the worst summer of their lives when they arrive on Janaconda Island in June of 1949. There's nothing to do and the rotted old mansion that will serve as their family's home is filthy and littered with junk. But when they discover the house's former owner was a notorious pirate who left behind cryptic clues to the location of stolen gold, they are swept into a dangerous adventure of discovery that tests the limits of their wits and courage.