The Fist of God is a 1994 suspense novel by British writer Frederick Forsyth, with a fictitious retelling of the Iraqi Project Babylon and the resulting "supergun".

His brother, Terry, an expert in Arab military studies, works with the Medusa Committee, a joint British-American panel investigating Iraq's weapons of mass destruction.

However, they are forced later to admit they have an unidentified top agent, codenamed "Jericho", whom they have been paying for information on the Iraqi military and government through an account in Vienna, but from whom they have not heard since the invasion began.

The Medusa Committee concludes that Iraq's biological weapons capability is not a threat and, despite possessing a plentiful supply of yellowcake, it's had insufficient time with its limited underground gas centrifuges to produce the weapons-grade uranium-235 to make an atomic bomb.

Terry Martin takes the photographs to Lawrence Livermore National Laboratory in California to see if they can identify the discs, where a retired Manhattan Project employee identifies the discs as Calutrons (California Cyclotrons), a low-tech solution to refining uranium, ideal for Third World nations wanting to develop their own nuclear capability, and subsequently determines that had Iraq used them in conjunction with their existing centrifuges, they could have made a nuclear bomb already.

Jericho reveals the location of a factory where such a bomb was put together and it is destroyed; however, he later reports that the weapon had been moved hours prior to a new site, a place called the "Qa'ala" (Fortress).

The Americans nonetheless remain highly skeptical because such a bomb would be too heavy to attach to a Scud missile and the Coalition's air supremacy would prevent a plane from getting close enough to drop it.

In order to bypass both these problems, Iraq's solution is a supergun, hidden in a classified location, designed to fire the atomic weapon, called "The Fist of God", into Saudi Arabia should the Coalition begin the ground phase of Desert Storm, which would kill approximately 100,000 soldiers, and the consequent radioactive fallout will be carried into Iran.