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.

In hopes of keeping their split amicable, Frances and Robert meet with a mediator. Frances confides in a co-worker, and Robert gets surprising financial news.

Robert evisages his 'Funspace', pitching it to Nick and also engages a well meaning, but ineffective, lawyer. Frances gets the keys to her new gallery, meets some interesting artists and also 'lawyers up', potentially at least, much more effectively. However, Robert somewhat upgrades his hire...

Frances and Robert try to set aside their differences and make their annual Christmas trip to her parents' house with the children.

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Frances chases a new role, but fails to consider some of the consequences. Robert has something of an epiphany and and a new found positivity with his kids; and also confronts Julian in a surprising way.

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.

Tensions between Frances and Robert ease after Lila has an emergency, but a cutthroat move by Frances' new lawyer sends Robert on a vengeful path. An encounter at the grocery store crystallizes Diane's feelings about motherhood. Frances makes a confession to her father at her gallery opening and is surprised by an unexpected visitor.