After the battle of Worcester at the end of the Civil War, the main aim of Oliver Cromwell's Commonwealth is to capture Charles Stuart. The future king's escape depends on the intrepid Earl of Dawlish, who as the Moonraker has already spirited away many Royalists. Dawlish travels to the Windwhistle Inn on the south coast to prepare the escape, where he meets Anne Wyndham, the fiancée of a top Roundhead colonel.