Right after Mark's next-door neighbor is murdered, he gets a new neighbor--the beautiful but mysterious Sylvia, who has just arrived from London. Mark is drawn into a mutually obsessive relationship with Sylvia. She is secretive regarding her past and Mark's friends caution him that she can't be trusted. But Mark won't listen to his friends or to the priest who later claims that Sylvia is a deadly threat. Mark is enchanted by Sylvia's beauty and charm, even though dating her has its challenges. Whether it's performing gymnastics on the ledge of the Golden Gate Bridge, creating an embarrassing...