Ubik by Philip K. Dick

Glen Runciter runs a lucrative business—deploying teams of anti-psychics to corporate clients who want privacy and security from psychic spies. But when he and his team are ambushed by a rival, Runciter is gravely injured and placed in "half-life," a dream-like state of suspended animation.

Soon, though, the surviving members of the team begin experiencing strange phenomena, like Runciter's face appearing on coins and the world seeming to move backwards in time. As consumables deteriorate and technology gets ever more primitive, the survivors must discover why this is happening and what a mysterious product called Ubik has to do with it...

Named one of Time's 100 greatest novels, Ubik is both a meditation on reality and a mind-bending puzzle.

"From the stuff of space opera, Dick spins a deeply unsettling existential horror story, a nightmare you'll never be sure you've woken up from.” Time

"Dick was a schizophrenic. Dick was a paranoiac. Dick is one of the ten best American writers of the 20th century, which is saying a lot." Roberto Bolaño

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