The Grinning Man

S4, E7: Jonathan Creek investigates a series of baffling disappearances in a "haunted" room at the top of a large gothic house. Two young women take shelter in the room one night and it's not long before the ominous 'presence' claims another victim. Determined to get to the truth about what has happened, the fearlessly sceptical Joey Ross finds herself working alongside veteran lateral thinker Jonathan Creek, as together they try to solve the riddle. Can Jonathan once again render the impossible, possible? And will he - this time - be eclipsed by the sheer, raw intuition of his young counterpart?