Can you unmask the murderer in The Biggest Whodunit in History? Use your detective skills to uncover the evidence and prove you're the best cop on the case!

If you've got what it takes to become our Cop Star, you could win a trip for a family of four to San Francisco, home to the world famous Alcatraz prison.

Will your suspicions be proved correct when the killer is unmasked on 25 October?