Alors qu'elle se rend à l'anniversaire de ses parents, une jeune femme est prise par erreur pour le rendez-vous galant d'un homme.

Rob, in his late thirties, who needs to decide if he wants to have a baby with his girlfriend Marta, but he’s worried that he’s fallen out of love with her. He asks his seemingly unhappily married friends for advice, who all tell him that he won’t be able to do better so he might as well marry her. But when Rob eventually does propose to Marta, things don't go exactly to plan.