Back to the police station. Holmes claims that he wasn't napping just because he was sitting on a bench with his head lolled back and his eyes closed. Watson continues to be mopey, even though Holmes tells her she's providing a valuable service by being a sounding board. Back in London, he used to talk to a phrenology bust called Angus.
Gregson says they have a hit on the van. And we have a chase! There's the van right there! And there's a helicopter that's using thermal imaging! Neat! I mean, we don't actually see either the helicopter or the thermal imaging, but the dialogue suggests that both are out there. The van eventually gets run down and a man in a hooded sweatshirt runs for it. He doesn't get too far before he's body-checked into a fence. The van is empty. Holmes noses in and notes that based on the distinctive birthmark, the kid is Adam Kemper, the first victim of the Balloon Man. Twist!
Interrogation Room. Adam isn't talking. He's not just not playing along; he's refusing to say even one word. Gregson says a psychologist and the kid's parents are on the way. Watson tells a story about a child missing for a long time who had grown to sympathize with his captor. Holmes points out that at least two of the victims were found dead. He asks, "What role did Adam play in their deaths?" Holmes tells Gregson he thinks he can get through to Adam. Gregson tells him, "You're a consultant, not a cop." "Maybe not-a-cop is exactly what he needs." Obviously, he gets in. Gregson says he's only got five minutes, but he gets in the elevator to go to a different floor, so how will he know? In fact, when Holmes gets back to the interrogation room, how will the cops know that Gregson gave him permission? The correct answer is: because this show doesn't think about things like that.
So Holmes sits across from Adam in the Interrogation Room. He tells Adam about how he knows that a mysterious man took care of him: "Taught you to drive. Loved you. My father packed me off to boarding school" and so on. Holmes got bullied at school by someone named Anders. But: "The more Anders hurt me, the more I felt gratitude that he was actually paying attention to me." As someone who endured some bullying, I feel that I would have been more grateful with less attention. Anyway, now that Holmes has made an emotional connection, Adam says he cut his hand on the window in his room. But he loves the man, who would bring him doughnuts every morning. "He took care of me. He put a bandage on me." Gregson comes in to report that Adam's parents are here, and that they have brought lawyers. So this interview is over.