Join Holmes and Watson as they examine interrupted games to deduce prior moves. A series of increasingly complex chess mysteries culminates in a double murder perpetrated by Professor Moriarty. The master sleuth instructs his companion (and us) in the intricacies of retrograde analysis; readers need only a knowledge of how the pieces move.
Fifty original puzzles are set within a dialogue between Holmes and Watson as they use deduction and analysis to discover what moves were made before they arrived on the scene. The progressively more difficult puzzles include a double murder.