In 1974, a schizophrenic drug addict named Horselover Fat attempts suicide after a close friend succeeds at it. While struggling with guilt over her loss, Horselover is struck by an enigmatic beam of pink light that he attributes to a deity known as Zebra.

Afterwards, he experiences visions of the Roman Empire and gains detailed insight into early gnostic Christianity, which he chronicles in his exegesis. Horselover also credits the light for imparting crucial medical information that saves the life of his son, Christopher. A short time later, however, his wife Beth leaves him, taking Christopher with her.

Through all of this, Horselover’s friends—David, Kevin, and Phil K. Dick—believe that he is insane, until Kevin persuades the group to see an independent science fiction movie called VALIS, playing at a small theatre in town. The film, about an alien satellite called Vast Active Living Intelligence System, contains overt and subliminal messages that correspond to Horselover’s experiences after encountering the pink light. Convinced now that Horselover’s account was legitimate, the four friends take up a quest to contact the filmmakers in the hopes of learning the truth about VALIS and the information it revealed to Horselover.

It is explained at the beginning of the story that Horselover Fat might be Philip K. Dick projecting his inner turmoil into a second personality. Either way, VALIS is one of the most bizarre, engaging, imaginative, and occasionally disturbing novels I’ve ever read and could have been conjured only from the mind of Philip K. Dick.