«The Adventure of the Priory School» by Arthur Conan Doyle

"The Adventure of the Priory School", one of the 56 Sherlock Holmes short stories written by Sir Arthur Conan Doyle, is one of 13 stories in the cycle collected as The Return of Sherlock Holmes. Doyle ranked "The Adventure of the Priory School" tenth in his list of his twelve favorite Holmes stories.
Holmes receives a visit from Dr. Thorneycroft Huxtable, the founder and principal of a preparatory school called Priory School in Northern England. He beseeches Holmes to come back to Mackleton with him to look into the disappearance of one of his pupils, the ten-year-old Lord Saltire, whose father is the very rich and famous Duke of Holdernesse. Huxtable explains that not only the boy has disappeared, but also the German master, Heidegger, along with his bicycle.
Once in the North, the Duke says to Holmes that he does not think that his estranged wife has anything to do with his son's disappearance, nor has there been a ransom demand. Holmes establishes that the boy and his kidnappers could not have used the nearby road without being seen, suggesting that they went cross-country. As if to confirm this, the police find the boy's school cap in some gypsies' possession. They swear that they simply found it on the moor, but the police lock them up…
Famous works of the author Arthur Conan Doyle: A Study in Scarlet, The Sign of the Four, The Adventures of Sherlock Holmes, The Memoirs of Sherlock Holmes, The Hound of the Baskervilles, The Return of Sherlock Holmes, The Valley of Fear, His Last Bow, The Case-Book of Sherlock Holmes, Stories of Sherlock Holmes, The Lost World.