Ken Follett

There are two ways of writing spy stories. One is to have the rival spies play out their contest in isolation, unconnected with the real world of armies and grain deals and elections. Real-life espionage is probably like this a lot of the time. Although the real function of spies is to find out about the other side’s army, nevertheless the most prestigious section of an intelligence department is normally the section that spies on the other side’s intelligence department. John le Carré writes novels about this kind of espionage: we know that whether or not Smiley defeats Karla, it will make no difference to the price of eggs. The alternative is to link the spies with some event or threat of world-shaking importance, like the assassination of De Gaulle or the kidnapping of Churchill.

Anthony Summers’s argument is remarkably simple. There is a tape-recording of the gunfire which killed President Kennedy. The third and fourth shots are too close together to have come from a single gun. Two guns means two gunmen, and two gunmen make a conspiracy.