A Study in Scarlet
"A Study in Scarlet" by Arthur Conan Doyle is a detective novel published in 1887. This groundbreaking work introduces Sherlock Holmes and Dr. Watson as they investigate a mysterious murder in London. When a man is found dead with the word "RACHE" written in blood, Holmes must unravel the scarlet thread of murder running through the case. The investigation leads to a dramatic tale of revenge spanning two continents, connecting a London crime scene to events in Utah's Salt Lake Valley decades earlier.
Wikipedia page about this book: en.wikipedia.org/wiki/A_Study_in_Scarlet