Yahoo Web Search

After a quarrel with her husband, an unnamed woman (Jean Simmons) heads to London on the train for a shopping trip. In her compartment, en route, a much younger man (Leonard Whiting) approaches her and tries to strike up a conversation, from which she escapes. But the man remains close behind, following the woman to a department store and then to her mother's apartment. The man offers her the alluring possibility of an affair, despite their many differences. Wikipedia