Ali Devlin isn't the type of woman to have an affair… But as her marriage to her childhood sweetheart Colin turns bitter, she begins to rediscover the woman she once was. She seeks solace from her toxic relationship by throwing herself into a new job that she loves; confiding in her best friend Corina; and, most dangerously of all, spending more and more time with her workmate Owen – who just so happens to be passionate, charming and everything her husband used to be. Then, one heat-of-the-moment decision on a business trip to Amsterdam sets off a series of events that will change the course of all their lives forever.