When a shipwreck is discovered on a lonely north coast beach, Mitch Mango and his friends Lockie, Abby and Alexa get into more than they bargained for: a desperate chase, a 200 year old message and a mysterious riddle which begins a quest to find the lost Holey Guinea, Australia's first coin. But they are not alone Can they succeed where ruthless foes thwart their every move? Discover the secrets that await on their thrilling adventure to Misty Point ...