Season 1

1. The Undoing

Grace Fraser is a successful psychologist who lives in Manhattan with her husband Jonathan, an oncologist, and their young son Henry, who attends the elite Reardon School. Grace helps some of the other Reardon parents plan an auction event, where she meets an enigmatic woman named Elena. Grace continues to encounter Elena over the next several days: once in a gym bathroom, where a nude Elena approaches her and remarks on her "kindness," and later at the auction itself, where Grace finds Elena crying in the bathroom and consoles her.

As she leaves the event, Elena kisses Grace on the lips in the elevator. The next day, Elena's body is discovered in her artist's studio by her young son, also a Reardon student. The police rule the case a murder and question Grace and her friends; Elena's husband is noted as a potential suspect. Grace attempts to reach Jonathan, who is supposedly at an oncology conference in Cleveland, but finds that he has left his smartphone in the nightstand by their bed. Unable to trace her husband's whereabouts, Grace becomes paranoid and experiences visions of the scene of Elena's murder.

2. The Missing

Grace becomes increasingly worried about her husband and tries to locate him. A visit and questioning from Detective Joe Mendoza reveal that Jonathan is no longer employed at the hospital. His termination stems from allegations of inappropriate contact with Elena. It is determined that Elena's husband, Fernando, has an alibi, making Jonathan the prime suspect. Upon her return home, Grace finds the police conducting a search and seizure and is informed that they intend to perform a paternity test on Elena's infant daughter. To avoid media attention, Grace takes Henry to their beach house. There, Jonathan surprises Grace and admits to his infidelity but insists he did not murder Elena. As Jonathan hugs Henry, Grace calls the police.

3. Do No Harm

The police arrive via helicopter and arrest Jonathan. The detectives reveal Jonathan is the father of Elena's daughter. There is a short court hearing, and he goes to jail. Fernando confronts Grace. Grace later informs the police, and says that she felt threatened. The police indicate that Grace is also a suspect, and she asks why. The police then show a video from an outside camera around the place of the murder, on the night of the murder. The video shows Grace walking at night.

4. See No Evil

Further camera footage shows Grace walking by the same neighborhood numerous times the night of the murder, ruling her out as a suspect. Grace's father Franklin Reinhardt reluctantly arranges Jonathan's bail and hires Haley Fitzgerald as their defense attorney for the trial. The detectives reveal to Grace that Elena had developed an obsession with her through partially nude paintings. Jonathan tries to reason with Fernando regarding Elena's murder. Fernando wants nothing to do with Jonathan, but he allows Jonathan to tend to his and Elena's daughter. Haley arranges a television interview with Jonathan to help shape his public image for the trial. Jonathan claims to know who might have killed Elena.

5. Trial by Fury

The court case against Jonathan continues. His lawyer seeks to create reasonable doubt over Jonathan's guilt and suggests that Fernando could be a suspect but that the police dismissed this possibility. When she cross examines Fernando she asks if his wife was seeing a psychiatrist, which she was, and also if he is seeing one, which he denies. She then questions the detective who admits that he did not consider Fernando as a suspect and lies that there was no one else. The lawyer then shows the video of Grace. Jonathan reveals to Grace that he accidentally left the door open when he was 14, inadvertently causing his 4-year-old sister to be killed by a car. Grace calls his mother Janet, who says Jonathan never showed remorse or grief and estranged himself from his family when he grew up. Grace finds the hammer murder weapon in her son's violin case.

6. The Bloody Truth

Henry reveals he found the hammer in the fireplace at the family beach house and hid it to keep his father from being arrested. During the trial, Jonathan gives his testimony, admitting his infidelity, but insisting his innocence over Elena's murder. Haley brings Miguel to the stand, where Miguel suggests Fernando had been abusive towards Elena. Grace requests to take the stand and after claiming Jonathan to be a person of empathy, the prosecutor gets her to reveal her conversation with his mother. Jonathan and Haley realize Grace asked to take the stand as a ploy to allow her to suggest her belief in Jonathan's guilt.

With Jonathan's conviction all but guaranteed, he asks Henry to breakfast before the verdict, only for it to be a ruse for Jonathan to escape with Henry. Flashbacks reveal Jonathan murdered Elena after ordering her to stay away from his family. After being chased by police and almost getting hit by a truck, Jonathan threatens to jump off a bridge and commit suicide. Grace arrives via helicopter to rescue Henry and the police arrest Jonathan.