I AM _ _ _ _ Locked

I was walking down the street looking at all of the beautiful buildings. But really I was looking for a specific house number: 221B Baker Street. I had a slight issue. I found the building, I knocked on the door, and a elderly woman came to the door, “Hello sweetheart! I assume you’re here to talk to Sherlock Holmes, right?” Without saying a word I nodded my head. “Well come on in then, I’ll show you to him.” I stepped inside, to a neat entry way, and up the stairs. I followed the woman up the stairs to an apartment, that obviously needed cleaning.