Sometimes history is shaped by unknown people who operate in the shadowy world of espionage. And this story of war, deception and murder has a plot worthy of a John le Carre novel.

Thirty-five years ago, the armies of Egypt and Syria launched a surprise attack against the state of Israel on Yom Kippur, the holiest day of the Jewish year. Militarily, it ended in a stalemate, but in practical terms the war changed the map and the politics of the Middle East.

At the center of it all is a little known story about one man who played a major role in the outcome. Strangely enough, he's a hero in both Egypt and Israel, considered by each of these former enemies to be their greatest spy ever.

The question is: who was Ashraf Marwan really working for? And who finally murdered him in London?