This document summarizes information about three famous detectives: Sherlock Holmes, Doctor Watson, and Agatha Christie. It notes that Sherlock Holmes and Doctor Watson lived together at 221b Baker Street in London from 1881 to 1904, as depicted in stories by Sir Arthur Conan Doyle. It also provides biographical details about Agatha Christie, describing her childhood education, marriage, work as a nurse during World War I where she got the idea to write detective novels, and some of her most famous works which made her one of the highest paid writers in the world by 1920.