Demelza discovers the French are smuggling arms into Cornwall, but Ross is determined to take vengeance on Merceron and Hanson for framing Ned and returns to London to confront them. The Enyses follow, and Caroline must put her insecurities aside to support Kitty in her battle against Merceron, drawing perilous attention to herself in turn. Sam continues to meet with Tess against all caution as Cecily and Geoffrey Charles plan their escape with Ross's help, but the danger that stalks the Poldarks follows swiftly.