The fourth part moves forward a few more years. Wilf has died from the complications of a stroke, and Nancy takes the opportunity to travel. She is in a large city when she randomly encounters Ollie. She and Ollie have a long discussion, in which he discusses his travels with Tessa in the United States. He says that funding for research disappeared after World War II, forcing him and Tessa to work on the vaudeville circuit. The strain of performing gave Tessa horrible headaches and gradually eroded her powers, but she and he developed an intricate system with which to deceive their audiences. Eventually, Ollie says, Tessa died. Nancy does not contradict him. He drives her back to her hotel, and she opens her mouth to invite him up. Before she speaks, however, Ollie refuses. Nancy resolves to find Tessa and bring her to Ollie. She does not succeed.