1807: An old passion is reawakened when Captain Sir Thomas Kydd meets Persephone Lockwood, a beautiful and determined admiral's daughter from his past. To win her hand, he must enter the highest echelons of London society. Mixing with aristocracy and royalty brings other responsibilities. The Prince of Wales asks him to take temporary command of the Royal Yacht. Sailing to Yarmouth, Kydd realises they are being stalked by French privateers. The terrible threat sees Kydd call on daring seamanship of the highest order.