Aidan Quinn credited as playing...
Captain Thomas Gregson
- Captain Thomas Gregson: What is that?
- Sherlock Holmes: This is an Enigma machine. During the Second World War, this device represented a transformative leap forward in cryptography. It is a product of pure genius.
- Captain Thomas Gregson: What's it doing here?
- Sherlock Holmes: We're keeping up with the Joneses. Or rather, keeping up with the Folsoms. Bonzi Folsom. He had the very same model in his apartment. I noticed it tucked under his desk. Didn't quite fit the rest of his aesthetic. Every day, Mr. Folsom uses his Enigma machine to encrypt messages he wants to send to his SBK brethren. He then takes the ensuing codes and disguses them as file names on his social media feed. His cronies then, using their own Enigma machines, decrypt the messages, carry out the orders.
- Dr. Joan Watson: There are digital Enigma simulators online, but Bonzi uses a real one. So we thought we'd better get one, too, in case he modifies his to affect the encryption.
- Captain Thomas Gregson: How long before we're reading his mail?
- Sherlock Holmes: Might take a while. We've narrowed it down to 100 billion substitution codes.
- Dr. Joan Watson: We should talk to Shinwell's neighbors.
- Sherlock Holmes: It's already done. No one saw or heard anything suspicious. You may have arrived just minutes after the killer left, but it might as well have been years. This scene is as cold as they come.
- Captain Thomas Gregson: You said your friend was working for the department as a CI. He was undercover in SBK?
- Sherlock Holmes: That's right.
- Captain Thomas Gregson: Gang informants have two jobs that can get them killed. I get what this looks like, him getting stabbed in the back.
- Dr. Joan Watson: That's what this gang does to snitches. You stab them in the back, they do the same to you. It's been that way for years
- Sherlock Holmes: There's no sign of forced entry. Whoever did this may have been sent because Shinwell was willling to let them in.
- Dr. Joan Watson: We trained him. He would never turn his back on someone he didn't trust completely. It was SBK, I'm sure of it.
- Captain Thomas Gregson: Do you have any idea why he invited you down here?
- Dr. Joan Watson: He said he was making progress, moving up in the gang. Whatever he needed, he knew I'd try to help him.
- Captain Thomas Gregson: You were that close?
- Dr. Joan Watson: It was complicated. I believed in what he was doing.