Reality breakdown is the central experience of Dick's fiction. Indeed, it would be hard to find a story of his, no matter what elements of science fiction were being used, in which it was not present in some form or another. But The Three Stigmata of Palmer Eldritch (1965) takes place in part on a colonized Mars like that described in Martian Time-Slip. A hallucinogenic drug, Can-D, allows the planet's demoralized colonists to retreat into an acceptable fantasy analogue of Earth. Leo Bulero, the big protagonist, gets rich by supplying their needs. But when Palmer Eldritch, a business competitor, returns from the Prox system with a better drug, Leo is concerned and hostile. The new drug, Chew-Z, transports its users to universes of their own, which they can manipulate as they will. These universes all have a common god, however, and that god is Palmer Eldritch, one...