Three-year-old Simon discovers gold and diamonds buried on the beach, and the news brings trouble fast. Pirates, Vikings, and other rivals all want the treasure, but Simon and his brother fight them off one group at a time. When their neighbors kidnap their parents to force a deal, the brothers stage a rescue — only to face a shocking betrayal when their parents turn against them. In the end the brothers win, and Simon buries the treasure safely back beneath the sand.