William Powell and Myrna Loy star in this romantic comedy as a married couple whose relation goes terribly wrong when a mother-in-law's visit drives the pair Love Crazy. Everything seems perfect for Susan and Stephen Ireland (Loy and Powel -- The Thin Man films) until Susan's mother (Florence Bates) stays for an extended visit. Now, a mother-in-law's misunderstanding of Stephen's call on a former girlfriend leads Susan to go to great lengths to make Stephen jealous and to their agreeing to a divorce. But when Stephen changes his mind -- and realizes that his wife can't divorce him if he's declared legally insane -- Susan sees this feigned mental illness as an opportunity and has him committed to an asylum against his will!