The Lost Daughter had its world premiere at the 78th Venice International Film Festival on September 3, 2021, where Gyllenhaal won the Golden Osella Award for Best Screenplay.[6] It began a theatrical limited release in the United States on December 17, 2021, prior to streaming on Netflix on December 31. The film received acclaim from critics.
While on holiday in Greece, middle-aged college professor Leda Caruso (Olivia Colman) meets Nina (Dakota Johnson), a young mother, after Nina's three-year-old daughter Elena goes momentarily missing on the beach. Leda finds Elena and returns her to Nina, who expresses her growing exhaustion and unhappiness. Elena is upset after she loses her favourite doll, which Leda has secretly taken. In flashbacks, it is revealed that young Leda (Jessie Buckley) also struggled with being a young mother to her two daughters, Bianca and Martha, often losing her patience and becoming withdrawn from her family.
One evening, Leda has dinner with Lyle (Ed Harris), her hotel's caretaker, who sees that she has the doll but doesn't comment on it, nor does he tell Nina. Leda later discovers Nina is having an affair with Will (Paul Mescal), an assistant at the resort, and Nina explains her husband Toni (Oliver Jackson-Cohen) is very controlling. The search for Elena's doll continues, with Nina even putting up flyers offering a reward for its return.
At a market, Leda buys Nina a hatpin to help hold her sunhat in place. When Nina asks Leda about her daughters, Leda becomes emotional; she reveals that she had abandoned them for three years after she became too overwhelmed, leaving them with her now ex-husband, during which time she had an affair with a fellow professor (Peter Sarsgaard). She admits that being away from her daughters felt "amazing", and she only went back to them when she genuinely missed them. Nina learns that Leda knows about her and Will, and Will later asks Leda if they can borrow her apartment to have sex.
The next day when Nina arrives at Leda's to get the apartment keys, Leda admits to being a selfish and "unnatural" mother and warns Nina that her depression will never go. Leda also gives her Elena's doll, confessing that she took it and that she was "just playing". Nina reacts angrily and stabs Leda in the stomach with the hatpin before leaving. That night, Leda packs her bags and leaves the resort, but drives her car off the road due to the pain from her wound. She stumbles down the beach and collapses on the shoreline.
The next morning, Leda awakes on the beach and calls Bianca, who happens to be with Martha. They express their relief to hear from their mother, from whom they had not heard from in a few days. Leda says she is fine and then looks down to discover an orange in her hands; she peels the orange skin off "like a snake", the way she had done for her daughters when they were little.
At its opening night world premiere, the movie received a four-minute standing ovation from Venice Film Festival attendees in the Sala Grande.[30]
On the review aggregator website Rotten Tomatoes, 96% of 181 reviews are positive, with an average rating of 8/10. The website's critical consensus reads, "A strikingly assured debut for writer-director Maggie Gyllenhaal, The Lost Daughter unites a brilliant cast in service of a daringly ambitious story."[31]Metacritic, another aggregator, sampled 46 critics and calculated a weighted average score of 86 out of 100, indicating "universal acclaim."[32]