Jane (Meryl Streep), who owns a successful bakery in Santa Barbara, California, and Jake Adler (Alec Baldwin), a successful attorney, divorced ten years earlier. They had three children together, two girls and a boy, who are grown. Jake, who was cheating on Jane, married the much younger Agness (Lake Bell).
Jane and Jake attend their son Luke's graduation from college in New York City. After a dinner together, the two begin an affair, which continues in Santa Barbara. Jane is torn about the affair; Jake is not. While Agness has Jake scheduled for regular sessions at a fertility clinic, Jake is secretly taking medication to decrease his frequent urination, the side effects of which are decreased sperm count and dizziness. After one of his sessions he has a lunchtime rendezvous with Jane at a hotel. Jake collapses in the hotel room and a doctor is called. The doctor speculates that the reason for Jake's distress may be the medication and says he should stop taking it. Jake and Jane's children know nothing of the affair, but Harley (John Krasinski), who is engaged to their daughter Lauren, spots the pair and the doctor in the hotel but keeps silent.
Adam (Steve Martin) is an architect hired to remodel Jane's home. Still healing from a divorce of his own, he begins to fall in love with Jane. On the night of Luke's graduation party in Santa Barbara, Jane invites Adam to the party. She is stoned when he picks her up because she has taken a hit from a marijuana joint that Jake had given her earlier. Before going into the party, Adam smokes some of the joint with Jane. Once inside, they are laughing and happily high, Jake becomes jealous observing them, and after pressing Jane, smokes some with her also.
Agness then observes Jake and Jane dancing together and senses they are having an affair. When they leave the party, Adam asks Jane if they could have something to eat. Jane takes him to her bakery and they make chocolate croissants together. Jake and Agness separate, although it is not clear who leaves whom. Eventually, by a webcam in Jane's bedroom, Adam sees Jake naked and realizes that the two have been having an affair. Adam tells Jane he cannot continue seeing her because it will only lead to heartbreak. Jane's kids also find out, and they are not happy about Mom and Dad getting together again because they are still recovering from the divorce. Jane tells them she is not getting back with Jake. Jane and Jake talk and end their affair on amicable terms.
The film ends with Adam at Jane's house ready to commence the remodeling. Before the credits roll, Jane and Adam are seen laughing about the chocolate croissants while walking into her house.
Meryl Streep as Jane Adler, a successful bakery owner.
Steve Martin as Adam Schaffer, Jane's architect.
Alec Baldwin as Jacob "Jake" Adler, Jane's ex-husband.
Lake Bell as Agness Adler, Jake's wife.
Hunter Parrish as Luke David Adler, Jane and Jake's son.
Zoe Kazan as Gabby Adler, Jane and Jake's younger daughter.
Caitlin FitzGerald as Lauren Adler, Jane and Jake's older daughter.
John Krasinski as Harley, Lauren's fiancé.
Mary Kay Place as Joanne
Rita Wilson as Trisha
Alexandra Wentworth as Diane
James Patrick Stuart as Dr. Moss, the plastic surgeon
Blanchard Ryan as Annalise
Michael Rivera as Eddie
Robert Curtis Brown as Peter
Peter Mackenzie as Dr. Alan, Jane's therapist.
Rosalie Ward as Alex
Jimmy Clabots as Chase
Emjay Anthony as Pedro Adler
Emily Kinney as Waitress.
Nora Dunn as Sally
Bruce Altman as Ted
Lisa Lynn Masters as the beautiful woman in elevator.