Lindy Sampson is a daring and brilliant 21-year-old hacker who's come to NYC to search for her abducted sister. But when her best friend signs her up for a dating app, Lindy begins to suspect that one of the guys she just met may be a dangerous stalker.

Reeling from a tragic murder, Lindy is determined to find the killer by going on dates with two suspects. But as she begins to let new people into her life, she puts herself and her friends on a dangerous killer's radar.

After a fresh abduction, Lindy's obsession with finding the killer grows. Her worlds collide when Sophia throws a party while Jake starts to develop a crush on Lindy, though he's emerged as the lead suspect in the case.

Lindy looks into the disappearance of five teens which leads Lindy and Tommy to an unexpected venue.

A media mogul throws a party at IRL to encourage New Yorkers to not be afraid.

A hospital becomes the latest target in a cyber-attack and the Flirtual killer gets closer to Lindy.

A couple is attacked in an apartment they rented online, and Jake asks Lindy to help him.

Lindy is drawn into the past by a message from the killer, and also unearths shocking revelations about her case.

Lindy looks deeper into her sister's abduction, turning to Jake for help as things between them heat up. Tommy and Connor investigate the dark internet, bringing to light a shattering revelation about the serial killer.

Lindy's search for her sister leads her to Hart Island, the burial site for New York's unidentified and unclaimed dead; and to a face-off with the killer that forces her to choose who and what is most important to her.