Elementary, Season 1

Watson:
It's funny, when I moved in, you didn't mention anything about your little uhh, surveillance system.

Holmes:
This is my Sanctum Sanctorum. Did you honestly believe there wouldn't be security measures?

Watson:
OK, is that M (gestures to a photo)? You told a bunch of children to go to upscale hotels to look for him, why?

Holmes:
Note the hands, vintage NG driving gloves. Quite expensive, but not nearly as expensive as his John Varvatos shoes. M has money. That much is obvious. He's also a recent immigrant to New York. Why did I assume he'd be in a hotel as oppose to a property he might own? Well it's quite simple, I noted a curious scent on the note that he left. I quickly realized it was, in fact, a combination of scents. Those of the high end hand soap and an even higher end mint based shampoo. Each product is used by various upscale hotels around the city but only one chain, The Bentencort, stocks both. My attendants and I each took a Bentencort and watched for M.

Watson:
Right, that's all very impressive, but I wanna know why you shared a photo of a wanted serial killer with a bunch of kids instead of going to the NYPD.

Holmes:
Several weeks ago you learned of the existence of a woman named Irene Adler. I told you she died.

Watson:
M killed her.

Holmes:
Obviously he realized the degree to which I was assisting the British police in the hunt to find him. He zeroed in on me, made things personal. As to why I'm withholding information from the NYPD, it's quite simple. I have no intention of capturing M. I have every intention of torturing, and murdering him.