After suffering a minor head injury, the Enterprise's chief engineer, Scotty, is ordered by Dr. McCoy to take a brief leave -- as part of his recovery process, of course -- in this episode of the popular sci-fi television series. Reluctantly, Scotty puts aside his workaholic tendencies and joins the doctor and Captain Kirk in traveling to a planet that bears a strong resemblance to 19th-century London. At first quaint, the parallels to Earth culture become frightening when the society proves to have its own variation on Jack the Ripper, and Scotty is accused of the crimes. The other officers attempt to defend their friend against the charges, but mounting evidence refutes their arguments for innocence. Even worse, Scotty not only lacks an alibi, but has begun suffering from blackouts which leave him with no memory of his activities during the times of the murders. The script for Wolf in the Fold was written by Robert Bloch, best known for the novel that inspired Alfred Hitchcock's Psycho.