‘I have been in the Valley of Fear. I am not out of it yet.’

Sherlock Holmes becomes obsessed with a new mystery upon receiving a coded message from his arch nemesis, Professor James Moriarty.

Following clues from the ciphered note, Holmes and Watson discover the body of John Douglas, a former gang member. Certain that Moriarty is behind the crime, Holmes vows to bring him down and put an end to his villainous plans.