Rosie's teacher provides Sarah and Holder with a new piece of evidence. Richmond's campaign team plans a new anti-crime television commercial. Mitch continues to struggle with the loss of her daughter, while Stan becomes more determined to find Rosie's killer, and asks his colleague Belko for help.

Sarah and Holder identify the mystery man with the tattoo while Jamie attempts to enlist Gwen's help and Stan learns his past may have come back to haunt him.

Richmond lends support to the investigation; Sarah tries to track down Rosie's key; and Stan deals with his troubled son.

Sarah seeks peace in the case's aftermath; the detectives pick up an unnerving new assignment; Lyric is tempted by her old life; Danette says good-bye.