When a violent home invasion turns out to be the result of a deadly batch of synthetic weed sweeping through Edgewater, Mickey and Boone race to contain the chaos; Cassidy uncovers disturbing new clues in her sister's disappearance case.

During Edgewater's Blood Moon Festival, Sheriff Mickey races to stop a suspected serial killer targeting young women. Meanwhile, a shocking discovery propels Deputy Cassidy into the crosshairs of the case.