The Bermuda Triangle has cast a shadow over Sam and Niamh Cutlers' lives since their mother vanished nine years ago. Her whereabouts remains a mystery and every year they return to the Florida Keys with their father, Matt, who is obsessed with solving the haunting puzzle. But Sam is bored with lazing around by the pool while his father hunts for the truth. Craving excitement, he and his friend, Callum, "borrow" Matt's boat. At first it's great fun, but when they find themselves marooned in a terrifying land, the boys realise they too have fallen victim to the Triangle's mysterious effects. Can they find a way home, or will they be lost forever?