Sherlock Holmes uses the science of deduction to solve crimes in the BBC One drama, Sherlock. Find case files, comments from Lestrade, John Watson and Molly Hooper on the forum and test your own powers of deduction with a weekly hidden message.

The Science of Deduction

by Sherlock Holmes

I'm Sherlock Holmes, the world's only consulting detective.

I'm not going to go into detail about how I do what I do because chances are you wouldn't understand. If you've got a problem that you want me to solve, then contact me. Interesting cases only please.

This is what I do:

• 1. I observe everything.
• 2. From what I observe, I deduce everything.
• 3. When I've eliminated the impossible, whatever remains, no matter how mad it might seem, must be the truth.

If you need assistance, contact me and we'll discuss its potential.