They follow Hughes to an abandoned building that he bought when he thought the place would gentrify. When they come in, Hughes starts to explain why he's there. He thinks they're from the Housing Authority and seems to be surprised that Emily's been kidnapped. Holmes accepts his claims based on his body language, and they leave.
Rhys gets a call from an Unknown Caller. Holmes grabs the phone and says he's not the police. The deadline gets pushed up twelve hours. And to make it more serious, there's a box outside the kitchen door. It's got a finger in it!
Holmes studies the finger. It appears to be Emily's. And his security cameras did not get a good look at the person who dropped off the box. However, the finger has a burn that suggests a particular kind of pre-war radiator. And it's got a kind of Ethiopian stew under the fingernails, which he knows because he tasted it. So that's two facts, and he can use them to check. Holmes seems super-tense and wound-up as he assures Watson that he's not on the edge of a relapse. He does suggest that she go downstairs to check on Rhys, who has been quiet for 37 minutes. As she leaves, Holmes puts a pin into a map.
Watson brings some tea into the room where Rhys is moping. I notice there's an old radiator in this room, but I guess it would be too big of a twist to have Emily hidden in the brownstone itself. Rhys is despairing, and even Watson telling him that she believes in Sherlock Holmes doesn't keep him from leaving.When he comes back, Holmes is watching the video over and over again. There are too many prewar buildings near Ethiopian restaurants to narrow it down. Rhys reminds him of the Tinsdale case, which does not appear to be an actual Sherlock Holmes story. It was a standard locked-room mystery, which Holmes solved instantly after being given some cocaine. The solution was that the maid has slipped some dry ice under the murdered man's bed and he suffocated on the CO2. Rhys puts a bag of cocaine next to Holmes. Holmes gets up and shoves him against the wall. Rhys protests that Holmes is talking about details and evidence, which isn't the Sherlock Holmes he knows. Watson breaks it up and Holmes hides the cocaine. Then he leaves.