Delmak-O is a dangerous planet. Though there are only 14 citizens, no one can trust anyone else and death can strike at any moment. The planet is vast and largely unexplored, populated mostly by gelatinous cube-shaped beings that give cryptic advice in the form of anagrams. Deities can be spoken to directly via a series of prayer amplifiers and transmitters, but they may not be happy about it. And the mysterious building in the distance draws all the colonists to it, but when they get there each sees a different motto on the front.

When a routine tour of a particle accelerator goes awry, Jack Hamilton and the rest of his tour group find themselves in a world ruled by Old Testament morality, where the smallest infraction can bring about a plague of locusts. Escape from that world is not the end, though, as they plunge into a Communist dystopia and a world where everything is an enemy. Philip K. Dick was aggressively individualistic, and no worldview is safe from his acerbic and hilarious takedowns. Eye in the Sky blends the thrills and the jokes to craft a startling morality lesson hidden inside a comedy.

In this biting satire, the Cold War may have ended, but the eastern and western governments never told their citizens. Instead they created an elaborate ruse, wherein each side comes up with increasingly outlandish doomsday weapons—weapons that don’t work. But when aliens invade, the top designers of both sides have to come together to make a real doomsday device—if they don’t kill each other first. With its combination of romance, espionage, and alien invasion, The Zap Gun skewers the military-industrial complex in a way that’s as relevant today as it was at the height of the Cold War.

In Radio Free Albemuth, his last novel, Philip K. Dick morphed and recombined themes that had informed his fiction from A Scanner Darkly to VALIS and produced a wild, impassioned work that sounds like a visionary alternate history of the United States. Agonizingly suspenseful, darkly hilarious, and filled with enough conspiracy theories to thrill the most hardened paranoid, Radio Free Albemuth is proof of Dick's stature as our century's greatest science fiction writer.

On Mars, the harsh climate could make any colonist turn to drugs to escape a dead-end existence. Especially when the drug is Can-D, which transports its users into the idyllic world of a Barbie-esque character named Perky Pat. When the mysterious Palmer Eldritch arrives with a new drug called Chew-Z, he offers a more addictive experience, one that might bring the user closer to God. But in a world where everyone is tripping, no promises can be taken at face value.