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.

When Fisher's mentor turns up dead, Kirsten's stitch reveals the officer was murdered by a serial killer she's been chasing for years. Camille's rebellious older brother Theo arrives in town with a whole lot of trouble. Meanwhile, Cameron is finally honest with Kirsten about his feelings for her.