When a self-claimed psychic by the name of Violet Moon helps the police identify a murderer during a seance Frank is hired to investigate.

Frank returns to London to inspect the scene of the alleged murder: his client’s garden shed. Back at his office he uses his ‘incredibly powerful brain’ to figure out how the psychic might have duped the police. Following another hunch he visits the psychic to inspect the séance room. Luckily he is a master of disguise.