sentences:  After a rooftop chase, where a fellow policeman falls to his death, San Francisco detective John "Scottie" Ferguson retires due to fear of heights and vertigo.Scottie tries to conquer his fear, but his friend and ex-fiancée Midge Wood says that another severe emotional shock may be the only cure.An acquaintance from college, Gavin Elster, asks Scottie to follow his wife, Madeleine, claiming that she is in some sort of danger.