Alternative (competitive) intelligence gathering: Sherlock Holmes

In the first of our occasional series profiling some of the most excellent examples of intelligence gathering in the history of mankind, we present our idol, Sherlock Holmes.

First, here he is played by Jeremy Brett, dealing with a pre-Microsoft filing system:

Most recently, this is from the BBC's radical and brilliant reworking of the original stories:

Conan Doyle's eventual dislike of Holmes is well documented. Less known is how pleased he was with another creation, French Hussar Brigadier Gerard, a Wodehousian character whose stories are hugely enjoyable.

We leave you with three typical Sherlock quotations:

It is a capital mistake to theorize before you have all the evidence. It biases the judgment.

You know my method. It is founded upon the observation of trifles.

My name is Sherlock Holmes. It is my business to know what other people don't know.