Sometimes nothing can be more important to solving a case than the tiniest detail; Sherlock Holmes understood this. One of Holmes greatest assets to his detective skills was his ability to not skim over details. Also, he would try and determine the relevance of details to a person or case. An example is when Mary Morstan presented the case of her missing father to Holmes and spoke of the letter that she had received that day. Before anything else Holmes wanted to see the envelope the letter had arrived in to determine the post mark date, type, and quality of paper. (Doyle, 133) Another universal characteristic of Holmes method was the hypothesis he formed about the case and people involved. In The Sign of Four, Holmes is constantly re-evaluating the case as it becomes more complex and he acquires more evidence. When Thaddeus Sholto brings Holmes, Watson, and Miss Morstan to Pondicherry Lodge and discover his brother dead in his chambers, Holmes gains an entire new perspective on the case. After only a short time of investigation, Holmes is able to determine that Jonathan Smalls was involved in Bartholomew Sholto’s death, that he had a peg leg, and a small partner to assist him in stealing the treasure. (Doyle, 165) Holmes method also included many specialized talents and abilities that separated him from other detectives.
Sherlock Holmes was a very well educated man that was comfortable with science and research. Many of his skills that made him a great detective relied on his considerable knowledge in various fields of expertise. Sherlock Holmes published monographs on topics such as the differences in ashes from: cigarettes, pipes, and cigars; as well as shoe prints and the form of the hand that resulted from work in different professions. (Doyle, 126) With his specialized knowledge Holmes could analyze evidence and use that to create a profile of someone. This is something other detectives such as Athelney Jones were unable to do without his knowledge. Despite his considerable knowledge, Holmes did not know everything, and in order to reconcile this, he made use of databases to conduct research. In The Sign of Four Holmes is stumped by who Small’s peculiar partner could be, however; after consulting a gazetteer he determines that his “savage” associate must come from the Andaman Islands. (Doyle, 186) Despite this, scientific knowledge and research alone cannot determine every case, which Holmes knew.
On top of his research and detective skills, Holmes was quick witted, physically active, and a people person. One of his greatest assets was his ability to socialize and make friends with people in all walks of life. His social skills were highly developed and this often aided him greatly when solving a case. At Pondicherry Lodge, the gatekeeper was not going to let Watson and Holmes enter until he recognized Holmes from a boxing match. Near instantly he allowed them entry because of his fond memory of fighting Holmes. (Doyle, 152) Another great asset to Holmes when solving a case is his use of intelligence and information gathering. Early in the story, Holmes is able to tell exactly where he is located in London as they travel to Thaddeus Sholto’s home for the first time. This makes apparent that Holmes has an intimate knowledge of London, its regions, and its people. (Doyle, 140) Another technique was employing the Baker Street irregulars, a group of kids that ran wild in the streets, to locate the Aurora and Mr. Mordecai Smith. The Baker Street irregulars could go anywhere, see anything, and overhear anyone because they are often ignored by most people as wild kids. (Doyle, 184) Also, once the Aurora was found, Holmes proved that he was a master of disguise. Concealing himself as an old fisherman with a hacking cough, Holmes visited the place where the Aurora was beached and awaiting to be put back out on the river. This gave Holmes enough time to inform the police in order to set a trap for Smalls and the Aurora when they tried to make their escape. (Doyle, 195) These and many other practical skills greatly assisted Holmes in solving his cases.