Sherlock Holmes and Dr. Watson investigate a peculiar case, brought to them by Trevor Bennett, the secretary of a professor named Presbury. Following a clandestine and unusual trip to Prague, Presbury has begun acting so uncharacteristic and strange, alienating everyone in his life, including his beloved dog. Holmes and Watson are intrigued, and upon visiting the Presbury home unveil the mystery behind the professor's odd behavior. Arthur Conan Doyle crafts a Jekyll and Hyde-ish narrative that David Timson performs with an almost eerie restraint, which helps to compound the bizarre details and create a surprising climax.
This is a story from The Casebook of Sherlock Holmes, Volume I collection.
These six cases are among the last undertaken by Sherlock Holmes before he retired to the Sussex downs. However, the problems facing the sleuth are as diverse and challenging as ever. What with seeking the whereabouts of the stolen Mazarin Diamond, discovering the importance of being called Garrideb, encountering a mysterious murder on Thor Bridge, searching for eternal youth and the threat of a vampire in Sussex, there is no sign of Holmes' deductive powers slowing down.