Fourteen-year-old Steven Green finds an old, hand-drawn map in his grandparents’ attic. There is a mysterious heart shape on the map, but all Grandpa remembers is burying coins when he was a boy. Steven’s grandparents have got money problems, and Steven wants to help them. So, he and his friend, Ben, follow the map and try to find the coins. But someone else wants to find the coins, too, and an exciting adventure unfolds. Who will find the coins first?