The infernal device

"Professor Moriarty, erstwhile Mathematics professor, is not 'the greatest rogue unhanged' that Sherlock Holmes would have one believe, but rather an amoral genius - and the only man Holmes has ever been bested by. The Infernal Device takes Professor Moriarty from London to Stamboul to Moscow and back, Sherlock Holmes close on his tail, until they both join forces to pursue and capture a man more devious and more dangerous than either of them has...