All of Philip K. Dick's books start in a very confusing manner. You're thrown straight into the action and it takes a little bit of time until you get used to his characters and his setting. 
 We're in 1992, travelling to the Moon is possible, and we don't bury our people after they die: we keep them in Half-Life, a state in which the living can communicate with the dead for a period of time. 
 The subject was disturbing and very, very fun to imagine. Dick really had a vast imagination, that I haven't seen in any other sci-fi writer. Just imagine this: you think you're alive and strange things start happening to you, so you start questioning your existence. Then, you find out you're not really alive, you're in Half-Life, you've already died in an explosion and out there is the real world. Seriously, this is terrifying just to think about. 
 I wasn't so into it in the beginning, the characters seemed a little bit unbelievable, but I soon started to like them, and as soon as Runciter's messages started appearing, I liked the book a lot. 
 The ending is even more scary, and open to any interpretation. What would you do if you started seeing people you know on coins?..