For years, former Marine Sullivan McGuire and his brothers tried to find their parents' killers, but someone had a strong interest in stopping them. Sullivan's ex-wife, Celia, unexpectedly provides assistance in the protracted investigation. In exchange for important information, she asks for a favor. Of course, Sullivan agrees to her terms, especially since he still loves his ex-wife, but does not know how to get her back. Suddenly, life itself interferes with their relationship: circumstances develop in such a way that the former spouses simply become necessary for each other...