Baltimore, 2020. Max s'installe pour quelques jours chez son ex-femme Gail, la veille du mariage de leur fille unique, Debbie. Celle-ci découvre cependant que son futur époux l'a trompée. Tandis que Max lui conseille de pardonner, Gail pousse plutôt Debbie à mettre un terme à cette relation, alors qu'elle a elle-même commis une infidélité quinze ans plus tôt.

It’s the day before her daughter’s wedding and things are not going well for Gail Baines. First thing, she loses her job – or quits, depending who you ask. Then her ex-husband Max turns up at her door expecting to stay for the festivities. He doesn’t even have a suit. Instead, he’s brought memories, a shared sense of humour – and a cat looking for a new home. Just as Gail is wondering what’s next, their daughter Debbie discovers her groom has been keeping a secret… As the big day dawns, the exes just can’t agree on what’s best for Debbie. Gail is seriously worried, while Max seems more concerned with whether to opt for the salmon or prime rib at the reception, if they make it that far. The day after the wedding, Gail and Max prepare to go their separate ways again. But all the questions about the future of the happy couple have stirred up the past for Gail. Because ‘happy’ takes many forms, and sometimes the younger generation has much to teach the older about secrets, acceptance and taking the rough with the smooth.