A Warm December (1973)

Dr. Matt Younger and his daughter arrive for a month-long visit to London for dirt-bike racing and, unexpectedly, a new romance for the widowed Dr. Younger. His new love interest is beautiful, playful Catherine, who seems to enjoy eluding Dr. Younger as much as she enjoys eluding the mysterious men who are following her. Their romance develops gradually. as does the viewer's understanding of what is going on with this charming woman, and the complications she brings with her.