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