War in Heaven is a novel written by Charles Williams and first published in 1930. It is a supernatural thriller that revolves around the quest for the Holy Grail, the legendary cup used by Jesus Christ during the Last Supper, and its significance in the spiritual realm.

The story is set in an English village called Fardles, where a young clergyman named Dr. John Redpath discovers that the local church's ancient altar stone is in fact the Grail. However, a group of dark forces, including a powerful sorcerer named Simon Leclerc, also becomes aware of the Grail's location and seeks to obtain it for their own purposes.

As the struggle for the Grail intensifies, the forces of good and evil clash in a cosmic battle that takes place both on earth and in the heavens. Angels, demons, and other supernatural beings are drawn into the conflict, and the fate of the world hangs in the balance.

"War in Heaven" is considered one of Williams' most significant works, showcasing his unique blend of Christian theology, occultism, and fantasy. It has been praised for its intricate plot, vivid imagery, and exploration of spiritual themes, including redemption, temptation, and the nature of evil.

Charles Williams (1886-1945) was a British writer, theologian, and literary critic who was associated with the Inklings, a literary group that included J.R.R. Tolkien and C.S. Lewis. He was born in London and attended University of London where he studied theology and literature.

Williams wrote poetry, novels, plays, and literary criticism, and his works often dealt with themes related to Christian theology, mysticism, and the occult. He is best known for his seven supernatural thrillers, including "War in Heaven," "Many Dimensions," and "The Place of the Lion." His writing was known for its complex plots, vivid imagery, and unusual mix of Christian theology and occultism.

Aside from his literary career, Williams was also a member of the Golden Dawn, a secret society that practiced occult rituals, and he had a particular interest in the esoteric traditions of Christianity. He worked as an editor at the Oxford University Press and also lectured on literature and theology.