New York firefighter Patrick Sullivan (Jeffrey Dean Morgan) had no idea his seemingly idyllic life was about to go up in smoke—especially as the unwitting, second-hand recipient of advice from famed love expert and radio host Dr. Emma Lloyd (Uma Thurman). One day he is a happy, go-lucky guy looking forward to a life with his soon-to-be-bride. The next thing you know, his fiancée Sophia (Justina Machado) is seeking couples counseling on the radio from Dr. Lloyd.
The no-nonsense, ever practical Dr. Lloyd questions Sophia's concept of romantic love and advises her to break their engagement, which she swiftly does. But when Patrick and his computer-savvy neighbor decide to give Dr. Lloyd a taste of her own medicine and "accidentally" join them in holy matrimony—something that doesn't go over too well with her fiancé (Colin Firth)—it isn't long before they learn that sometimes even an expert in love needs a second opinion…