After a teen girl dies from fentanyl-laced pills, a vigilante goes on a killing spree and McCall becomes a suspect.

Mel engages in a tense family reunion when she and her disapproving sister race against the clock to save their brother Edison after he's abducted. Also, as the team unravels the motivation behind Edison's kidnapping, Mel grapples with the fallout of her argument with McCall about training Delilah.