The Valis Trilogy is a series of three science fiction novels written by author Philip K. Dick. The trilogy includes Valis, The Divine Invasion, and The Transmigration of Timothy Archer. These works explore themes of reality, divinity, and the nature of consciousness, often blending philosophical ideas with Dick's unique narrative style. The central character in the first book, Valis, experiences a series of visions and encounters with a mysterious entity. This entity, referred to as Valis (Vast Active Living Intelligence System), influences the characters' lives and raises questions about the nature of God and existence. The trilogy reflects Dick's personal struggles with faith and mental health, making it a profound exploration of human experience.