The Adventure of Silver Blaze by Arthur Conan Doyle

When a prize racehorse vanishes and its trainer is found murdered, Holmes investigates a countryside mystery that hinges on small, overlooked clues. The key to the case is famously hidden in “the curious incident of the dog in the night-time.” The plot blends misdirection, false assumptions, and logical brilliance. Holmes uncovers the culprit and the missing horse in a masterful reveal. It’s one of the most famous and perfectly constructed Sherlock Holmes stories.