Álvaro and Saffron are very divorced. Their marriage was a disaster from which the only good thing to emerge was their beloved daughter Rose. Their mutual abhorrence is such that they can barely endure the minimal communication required to share custody, so they're thrown for a serious loop when it's discovered that, not only does Rose have a rare form of leukemia, but that, given the nature of Rose's genetic disorder, their best bet at keeping the child healthy and alive is to for Álvaro and Saffron to produce a second child who could provide a transfusion. The ex-spouses balk at the idea — and their new partners don't fancy it either — but they may have no choice but to bury the hatchet (in bed).