When Detective Jenny Hicks refutes Melissa Jacobs' claim that she was brutally raped by the Riverdale Rapist, Amanda sues the Police Services. Enter Jess King, ordered to investigate the Amanda Jacobs case while the Sex Crimes Unit continues to investigate the Riverdale Rapist. Jess believes Amanda and takes over both cases, to the ire of Hicks, who quits the Service. And new evidence suggests Amanda's rapist is far more sinister and much closer to home. The Major Crimes Task Force is pushed to its limits in bringing a serial predator to justice.

Jess King is aghast when she discovers her nemesis, Seymour Keegan, a vicious serial predator, is back in town and targeting a new victim. Jess knows Seymour killed a teen girl five years ago but she didn't have enough evidence to convict. Jess tries and fails to trap her Moby Dick in a sting, but when she turns up nothing but circumstantial evidence, Graci takes Jess off the case. Or so he thinks. Jess goes rogue and tracks Seymour on her own using her team and some questionable tactics. Seymour loves the attention, and that's when Jess makes the connection - he's a clinical narcissist and he's taunting her. When another girl goes missing, Jess must rein in her obsession in order to save her before it's too late.