Summary of Movie 

One night, Margot goes to a friend's house for her study-group. While David sleeps, Margot attempts to call him three times.
The next morning, David is unable to reach Margot but assumes she has risen early and gone to school. Later, he calls Margot's piano instructor, but is informed that Margot had canceled her lessons six months ago. David discovers that Margot had been pocketing the money for the lessons, before suddenly transferring $2,500 to a deleted account on Venmo. Realizing that Margot is missing, David calls the police, and the case is assigned to Detective Rosemary Vick (Debra Messing), who asks for information about Margot's personality and friendships. David manages to access Margot's Facebook and speaks to her contacts but discovers that Margot has not had close friends since Pamela's death. Vick calls to report that Margot made a fake ID for herself and shows traffic-camera footage of Margot's car at a highway-juncture outside of the city, suggesting that Margot may have deliberately run away.
David, unconvinced, discovers that Margot has been using a "vlogging" site called YouCast and that she frequently spoke to a working-class girl named fish-and-chips. Vick investigates this, and reports back that fish-and-chips is innocent, having been sighted in Pittsburgh. From Margot's Instagram, David finds that Margot frequently visited Barbosa Lake, which is near the highway-juncture. He drives to the lake and finds Margot's Pokemon key-chain on the ground. The police arrive and discover Margot's car underwater and an envelope containing $2,500.
A sweep of the surrounding area is conducted by the police and volunteers, but a thunderstorm slows the progress. Margot's body, however, is not found. David reviews the crime-scene photographs and notices his brother Peter's (Joseph Lee) jacket in the car. He then discovers text messages between Peter and Margot suggesting that they were having an affair. When David drives to Peter's house to confront him, the latter explains that they were smoking marijuana together, and accuses David of being an incompetent father who did not notice that his daughter was suffering from depression. The meeting is interrupted when Vick calls David, telling him that a former convict named Randy Cartoff (Ric Sarabia) has confessed in an online video to sexually assaulting and killing Margot, afterwards seemingly killing himself. An empty-casket funeral is arranged for Margot.
As David is uploading photographs to a funerary video service, he notices that the website's stock photograph features the same woman as fish-and-chips' profile-picture, implying that fish-and-chips is a false identity. Attempting to call Vick to report this, David instead reaches a dispatcher who inadvertently reveals that she volunteered to take the case, rather than was assigned to it. David searches for Vick using Google and finds that Vick knew Cartoff through a volunteer program for ex-convicts. He proceeds to report this to the sheriff, and at the funeral, Vick is arrested.
A few days later, Vick has agreed to confess to murder and other crimes in exchange for leniency toward her son Robert (Steven Michael Eich), who was using the online identity fish-and-chips to get close to Margot, as he was attracted to her. When Margot sent Robert $2,500, thinking that Robert was a working-class girl whose mother was hospitalized, Robert felt guilty and decided to confront Margot at the lake, during which they fought, and Robert pushed Margot off a fifty-foot ravine. Vick decided to cover up the incident, shoving the car into the lake and falsifying the story of the fake ID and of fish-and-chips in Pittsburgh. When David found the car, thereby invalidating the story of Margot having run away, Vick was forced to turn Cartoff into a scapegoat.
The film then jumps back to Vick right after being arrested. As she is being transported to the jail, David asks her where Margot's body is, and Vick responds that Margot is in the ravine, and that even if she had survived the fall, she couldn't have lived without water for five days. David tells the police to turn the car around, pointing out that a storm occurred on the third day which would have provided Margot with water. At the ravine, the rescue crew discovers Margot severely injured but alive.
Two years later, Margot is shown to have applied for college to major in piano, with her status as pending. Photographs and textual conversations show that the relationship between David and Margot has considerably improved.

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