A teenage Sherlock Holmes (Nicholas Rowe) meets and befriends his future sidekick, the bemused and bespectacled John Watson (Alan Cox). During their first semester of boarding school, a series of deaths occur on campus. Intrigued by the crime, Holmes looks into it and soon comes to suspect a poisonous hallucinogen. And then, in the midst of their investigation, Holmes and Watson stumble on a bizarre cult with a penchant for human sacrifice — after which they must struggle to escape.