Red and Marvin question whether Kate Kaplan might still be alive despite jumping into the Potomac. Raymond and Weecha drive to West Virginia to question Maureen Rowan, Kate's sister. He tells Maureen that his condolences might have been premature. She recommends he talk with Clara Moore, the woman Kate was seeing at the time of the death. Laszlo Jankowics kills everyone in a lab except for its owner, Wallace Avery. Still not trusting Aram, Reddington brings Laszlo, a dealer of illegal psychedelics, to Harold to be the next blacklister. He's the son of another blacklister who Ressler killed. Ressler returns with a search warrant for the home of Cole's lawyer, Lacroix. Cole was surveilling tech executive Stanford March. Laszlo's shooter tell Dembe and Park that Avery was Laszlo's chemist. At Dembe's request, Red's tracker, Rigelio, finds Avery. March admitted that he had been extorted over a sexual-harassment claim. He suggests they follow the money. Raymond's plan is to use Avery as bait to find Moore.  Reddington fakes killing Avery. Ressler figures out that Cole and Lacroix were running a scam. Cooper explodes because that isn't getting him any closer to answers about the conspiracy. Red and Weecha pretend that he can't find a cleaner to take care of Avery's body. Jankowicz leaves in disgust after calling his cleaner, Moore, instead. Raymond tells Avery to disappear then informs Dembe about Jankowicz's upcoming shipment. Aram decides to have everyone fill out their own evaluations. A headache cripples Park when she's pursuing Jankowicz and he escapes. Harold returns after cooling off. Red calls Cooper to tell him that Laszlo reached out for help getting out of town. Then he tells Harold that Kaplan might be alive. Clara found a note in Kaplan's handwriting. They see Kaplan then there's an explosion, with Weecha inside.