Frances and Robert--a middle-aged couple in the suburbs of New York City--try to figure out if their marriage is worth saving after a shocking event at their friend Diane's 50th birthday party makes them take a hard look at their own lives.
Frances rushes to intercept Robert before he tells the kids that she’s divorcing him. Everyone gathers at the hospital to support Diane as she waits for news on Nick’s condition. In the midst of the chaos, Frances considers finally signing a lease to open her long-planned art gallery.
Robert and Frances attend couples therapy in an effort to see if their marriage is salvageable. Frances gets advice from Dallas, while Robert vents at work. At home, tensions mount as Frances and Robert try to maintain a facade of normalcy for the children. Frances arrives at an epiphany.
Robert's lawyer insinuates that Frances is a negligent mother. Frances' lawyer encourages her to get more involved, so she drops in on a parents' committee meeting at school. Diane and Nick throw another party, where Dallas finds herself pursued by Robert's plus-one.