Inspector Lestrade learns Alice Murphy is engaged to their old teacher, Prof. Jacob Presbury. The professor is moody and forgetful. His daughter is jealous. Family friend Trevor is over-protective. Meanwhile Holmes investigates three monkeys stolen from the Primate Shelter, stolen as it turns out by Trevor who wants Alice for himself and so turned Presbury into an apeman.

• Sandy Ross
• Arthur Conan Doyle
• Phil Harnage

• Jason Gray-Stanford
• Viv Leacock
• Jennifer Copping