Altered States is a science fiction novel written by Paddy Chayefsky. The story follows Eddie Jessup, a scientist who becomes obsessed with exploring altered states of consciousness through sensory deprivation tanks and psychedelic drugs. As Eddie delves deeper into his experiments, he undergoes bizarre physical and mental transformations that blur the line between reality and hallucination. Altered States is a mind-bending and thought-provoking exploration of human consciousness and the limits of scientific inquiry.