Plot summary
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.
Credits
Adapted from Wikipedia contributors, The Undoing. Series, exact episode number and English title matched. Paragraphs formatted; references and illustrations omitted.