"Lily and Ryle have just settled into a civil co-parenting rhythm with their daughter, Emerson, when Lily suddenly runs into Atlas nearly two years after they last spoke. Elated that the timing finally seems to be right to give what they have together a real chance, Atlas asks Lily on a date. But Lily's excitement is almost immediately replaced by dread and anxiety when Lily remembers that Ryle, though no longer her husband, is still very much part...