Stephanie and Katie are strangers but they're in love with the same man - James Mortimer. Stephanie is his wife, Katie his mistress. And James is the cheating husband who's enjoying the best of both worlds. When Stephanie discovers that James is having an affair, she decides to track Katie down. But Stephanie is stunned to learn that Katie has also been deceived by James, believing him to be divorced and on the verge of asking her to marry him.