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 team is surprised when Kirsten's boyfriend, Liam, shows up unannounced; a young woman's extravagant social life may provide information about her death.
Camille makes preparations for her annual Halloween party: the team probes the suicide of a man who was a suspect in a college student's disappearance.