Jonathan Creek: The Clue of the Savant's Thumb

Another whodunnit for the lateral thinking sleuth, Jonathan Creek (Alan Davies), this time investigating spooky goings-on at a girls boarding school.

When a body seemingly disappears in front of a number of witnesses, Jonathan and Joey (Sheridan Smith) waste no time in trying to get to the bottom of the mystery.

But as they dig deeper, the pair discover there's a lot more to the puzzle than they first thought, including secret societies and the recurring appearance of a ghostly apparition.