Work your way through all the Sherlock Holmes canon one story at a time. I'm reading each story using the Serial Reader app but you can also read the short story collections: The Adventures of Sherlock Holmes, 
The Memoirs of Sherlock Holmes, 
The Return of Sherlock Holmes, 
His Last Bow, 
The Case-Book of Sherlock Holmes. The collections are listed as bonus books. Do what works for you, I'm not your mom.