The plan is almost disrupted when Burnett's fiancé, Rev. Harris, arrives unexpectedly, but the spies take him captive. Then the local minister, Matthews, and his wife (who had already met Harris) come to the house, but Tiel manages to get them to leave. Now equipped with the crucial information he needs about the British fleet movements, Hardt rendezvous with his submarine to arrange for a fleet of U-Boats to attack. Returning to the house, and confident that all is going to plan, Hardt makes advances to Tiel, but she rebuffs him. She leaves the house, believing she has locked Hardt in his room, but he gets out and secretly follows her, discovering that she has gone out to meet Ashington. Hardt overhears them talking and learns the truth: the British are fully aware of his presence, and have turned his mission into a trap for the U-Boats. Hardt's "contacts" are really British double agents – Ashington is in fact RN Commander Blacklock, and "Fräulein Tiel" is Blacklock's wife, Jill.