Against the counsel of his friends, psychiatrist Dick Diver marries Nicole Warren, a beautiful but unstable young woman from a moneyed family. Thoroughly enraptured, he forsakes his career in medicine for life as a playboy, until one day Dick is charmed by Rosemary Hoyt, an American traveling abroad. The thought of Dick possibly being attracted to someone else sends Nicole on an emotional downward spiral that threatens to consume them both.