Wilhelm Brock has spent many years searching for a sunken ship with a mysterious treasure. But when he finally discovers the missing piece of the puzzle, he suffers a heart attack. To raise money for an operation, his daughter Johanna wants to sell his ship. But Wilhelm’s mates Michael – Johanna’s ex – and Christian convince her to hunt for the treasure with them. Since the ship is worthless, Johanna agrees. Soon, however, they run afoul of Wilhelm’s rival, who will use any means to get the treasure.