chunk: After an attack on Helena, Ross accompanies Berlin on a stakeout at the institute where Helena lives in a dorm, after leaving Helena with Ross' wife Margie. When they see a flashlight shining on the same floor as Helena's apartment, Berlin investigates and is knocked unconscious by the killer, who then shoots and kills Ross with Berlin's .32 pistol. A grueling interrogation of Berlin by FBI special agent St. Anne ensues. St. Anne makes clear to Berlin that he figures him for Ross's murderer, but also inadvertently reveals information which clues Berlin to the identity of the true killer. Berlin tells St. Anne and Citrine who he believes the killer to be, but his deductions are met with disbelief. Berlin is arrested for Ross's murder, but is bailed out by Margie, who believes that Berlin is not the killer.