When sinister tokens are left around the flat Scarlet and the boys suspect their rarely glimpsed and mysterious room-mate 'Weird Bloke'. Despite this they press on with a fancy dress party for Hallowe'en but 'Weird Bloke' ruins this as well, by setting off the smoke alarm and driving the guests away. The four flat-mates decide to confront him once and for all. . .and are in for a shock!