When the algorithm for the Stitchers program turns up among thousands of classified documents hidden by a conspiracy theorist, Kirsten starts to suspect her colleagues. Meanwhile, Kirsten starts getting cryptic messages from an unexpected source.

While Camille preps for her annual Halloween bash, the Stitchers team investigates the suicide of a young man, who may have abducted a missing college student. The stitch leaves Kirsten spooked, and she begins to worry she’s being haunted by him as they race to find the missing girl.

When a bright, young lawyer is found dead, the team suspects she was murdered because of a case she was working on. After theorizing the lawyer was killed because she discovered something criminal about her firm’s high profile client, the team heads to the firm to interview her four ambitious coworkers, each of whom seems more suspicious than the last. While at the firm, Maggie crosses paths with a former college boyfriend who may be closer to the murder than she’d like to admit. Meanwhile, Camille’s interactions with Liam take a surprising turn, and Kirsten learns something shocking during the stitch.

Mitchell Blair directs Kirsten to shut down all investigation into finding her father. But Kirsten has finally made contact with someone she thinks can lead her to him. To gain her source’s trust, she tries to explain her role in the Stitchers program, without actually revealing the program’s nature. Treading carefully, Kirsten recounts the team’s current case, in which a series of murders is tied to a wildly popular new app.

When an MI6 agent is found dead, Kirsten struggles to sort through his memories due to the visual codes that the spy used to keep secrets. Meanwhile, Linus and Camille go on a double date, but not with each other.

The Stitchers team investigates the murder of an ex-Air Force officer who is found murdered, and the trail leads to a former co-worker and renowned UFO expert. The memories in the stitch have the team wondering if UFOs and extraterrestrial beings really exist.