Patrick and Beth's next adventure leads them to Plymouth Plantation in 1621, where they meet William Bradford, Miles Standish, and Chief Massasoit, who are trying to establish peace between the Pilgrims and the Indians. Things are anything but peaceful though when a musket is stolen and the Pilgrims conclude that the Indians are planning war. Only Patrick and Beth know who the real thief is-the traitor Hugh-and it's up to them to find him and stop him from causing trouble. When the cousins hear a gunshot during the first Thanksgiving feast, their worst fears are realized. They rush to the Mayflower and try to set right history, even as Hugh desperately tries to change it.