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.

The Stitchers team investigates a mysterious car accident that resulted in the death of a traumatic brain injury researcher. Meanwhile, Kirsten asks Linus for help deciphering a clue left by Ed Clark as she continues to question Maggie for more information on the origin of the Stitchers program.

Kirsten surprises the Stitchers team when they discover that she has a boyfriend, Liam, who shows up suddenly, prompting Maggie to covertly gather information on him. Meanwhile, a young woman’s extravagant social life may be the clue to her death.

It’s Kirsten’s birthday and the Stitchers team is assigned to look into a disease researcher’s suicide. When the body begins showing signs that it is carrying a deadly virus, the whole lab is placed under quarantine. The team jumps to action as they search for a way out, racing against the clock as, one-by-one, they come down with symptoms of exposure.

The Stitchers team investigates the murder of an online psychic whose symbolic, layered memories are further complicated when Kristen sees the murder of another person in the stitch. Maggie expresses her reservations about Kirsten’s relationship with Liam. Meanwhile, Camille hesitantly agrees to meet Linus’s parents.

The Stitchers team is on the defense when Cameron and Detective Fisher are targeted in a shooting. Kirsten's stitch leads them to Robert Barbiero, a security expert who has worked with Maggie in the past and was close to Kirsten's mom. As Kirsten follows the clues that Ed Clark left her, she finds unexpected answers to long-held questions.