The Adventure of the Creeping Man

S5 E6: Professor Presbury refuses to believe his daughter's story about a nightmarish intruder who appears at her window. Sherlock Holmes is persuaded by her fiancé, Bennett, to investigate, and although on the surface the matter appears to be trivial, the theft of several monkeys from the zoo and professor Presbury's erratic behaviour leads Holmes to believe that there is a real danger!