THE BINOMIAL ASTEROID PROBLEM. The deadly final encounter between Professor Moriarty and Sherlock Holmes took place at Reichenbach Falls on 4 May 1891. But when was their first encounter? When did Holmes first come to know that there was a evil genius behind a massive web of crime? This new story answers that question. What began with nothing more than a stolen Gladstone bag on wheels quickly escalates into murder and more. And if Holmes and Watson do not move fast enough, it could become much worse. This new story is a tribute -- a 'prequal' -- to the Canonical story of The Final Problem. The original story is included in the paperback edition.