Ubik

Ubik (/ˈjuːbᵻk/ EW-bik) is a 1969 science fiction novel by American writer Philip K. Dick. It is one of Dick's most acclaimed novels. It was chosen by Time magazine as one of the 100 greatest novels since 1923. In his review for Time, critic Lev Grossman described it as "a deeply unsettling existential horror story, a nightmare you'll never be sure you've woken up from."