Deus Irae is a post-apocalyptic science fiction novel by Philip K. Dick and Roger Zelazny. It was published in 1976. Deus irae means God of wrath in Latin. The name is a play on Dies Irae, meaning Day of Wrath or Judgment Day.Dick began the book but realized he didn't know enough about Christianity to finish it, so he asked Zelazny to collaborate on it with him. It took the partnership twelve years to finish.Plot introductionAfter 1982, the world experienced a devastating nuclear wa