"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. It was first published in Collier's in the United States on 30 January 1904, and in The Strand Magazine in the United Kingdom in February 1904. Doyle ranked "The Adventure of the Priory School" tenth in his list of his twelve favorite Holmes stories. Plot 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. Holmes and Dr. Watson go hunting for clues. They find a bicycle track, but it is not Heidegger's; it does not match his tyres. Holmes observes that one tyre has a patch on it. Almost everything observable has been obliterated by cow tracks (which are the only marks on the ground anywhere). Eventually, Heidegger's bicycle tracks are found, and they end where he lies, dead. After that, Holmes and Watson arrive at the Fighting Cock Inn, and meet the innkeeper, Reuben Hayes, who seems startled indeed to hear that Holmes wants to go to Holdernesse Hall, the Duke's nearby house, to tell him news of his son. The two men have lunch there, and Holmes suddenly realises that he and Watson saw many cow tracks out on the moor, but never at any time did they see any cows. Furthermore, the patterns of the hoof prints were quite unusual, suggesting that the cow in question trotted,