An elderly hotel guest has been pushed down the stairs. Was this an attempt at murder? What was the motive? Nobody saw the criminal, but he was heard and that may be all the evidence that Holmes needs.

Holmes: You must be in terrible shock. Please tell me what happened.

Mike: I'm furious. I was pushed down the stairs. A man who smelt terribly of smoke sneaked up behind and gave me a push in the back just as I was at the top of the main staircase. I'm afraid I didn't see him. I just heard his laugh as he ran away. I wish I could tell you more so that you could catch the vilain.

Holmes: Don't worry sir. I think we already know enough to catch him.

Mike: But how?

Holmes: With the application of a database my good man. Watson!

Watson: Yes Holmes?

Holmes: Let's go and apprehend the deviant.