Gregson reports that Mrs. Singh was in Mumbai when Pradeep disappeared. Could she have had a co-conspirator? Holmes thinks that's possible. But look at Pradeep's desk on the old website! It's right by the vent where the bomb was hidden, so he probably didn't do it. In fact, the bomb was probably meant for him.
Bell comes in to report that Pradeep Singh was killed by a gunshot wound to the chest. And there was a strange key on him that Holmes says goes to a safety deposit box. It says "SLB 699," which Gregson identifies as Sequoia Liberty Bank. In the safety deposit box, they find a VHS copy of Cheech & Chong's Next Movie. Bell says it's not a good movie, and I have to disagree. Although I haven't watched it at all recently. Holmes explains that the piece of tape over the notch means that it's been taped over. They had to put that in for the youths in the audience.
So now they have to find a VCR. Luckily, Holmes has several VCRs because he likes to watch 1970s police interrogations! So Bell, Holmes and Watson whisk off to the Brownstone. Bell gets a call from a CI, taking him out of the way for a brief intrusion by the subplot. Watson tells Holmes that Alfredo will meet him at 9:00. Now he doesn't like Alfredo because he wants to do better. Watson asks, "Is this about us?" She thinks he's being difficult because he doesn't want her to leave. Good work, Watson. She realizes that he only liked Alfredo when he thought she wouldn't like him. So now that she's on board, he's out.
Bell is back. The VCR is connected to all six televisions. They see a younger Pradeep set up a secret camera before a high-end prostitute comes in. It's Heather Van Owen! Who I will remind you is Lisa Edelstein!
At the police station, Heather fills out a consent form so the police can talk to her. They show her the tape of her as a young prostitute and Holmes says she came from humble origins (her father was in construction), so she must have needed money to start her business. She would like the tape turned off. Holmes says she built a new life for himself on the ashes of the old one. But Pradeep realized his new boss was one of the prostitutes he'd recorded years earlier, so he was able to demand several raises and promotions. Holmes says the laws against prostitution are "rather Victorian" (which is funny, since Sherlock Holmes himself is rather Victorian), but that doesn't matter. So the point is that he accuses her of building a pipe bomb to kill Pradeep, which didn't work. So she shot him instead. And her father probably taught her to hang drywall, which helped her with her absurd plan to hide the body in the same building where she committed the murder. Holmes adds that it's no wonder she moved the company, since she knew there was an unexploded pipe bomb in the building.