Dr Emma Lloyd (Uma Thurman) is a popular New York radio DJ whose sensible practical love advice is listened to and loved by women everywhere. Off-air her own life is equally successful with wedding plans to dependable fianc Richard (Colin Firth) running smoothly until she discovers that she's already married to someone else!

With her life turned upside down Emma frantically tracks down her mystery husband firefighter Patrick Sullivan (Jeffrey Dean Morgan) to annul the marriage. However as the two spend more time with each other she soon discovers that following her own advice might not be as easy as she thought!