Murder, other than in the most strict forensic sense, is never soluble. That dark human clot can never melt into a lucid, clear suspension. Our detective fiction tells us otherwise: everything is just meat and cold ballistics. Provide a murderer, a motive and a means, and you have solved the crime. Using this method, the solution to the Second World War is as follows: Hitler. The German economy. Tanks. Thus, for convenience, we reduce the complex events.