S7E11 - The Adventure of the Priory School, Part 1

The startling arrival of Dr. Thorneycroft Huxtable has shaken Holmes and Watson into rapt attention. Their new client is the principal of a preparatory school, and has arrived at Baker Street desperately in need of Holmes's help to find the missing son of the Duke of Holdernesse. The German master, Herr Heidegger, has also disappeared. In an effort to protect the Duke from scandal, the disappearance has been kept secret for three days, but with no sign of the missing persons, it's time to bring in Sherlock Holmes's expertise. As Holmes and Watson learn the facts of the case...