Ubik
(Book)

"A Mariner book".

Glen Runciter's anti-psi security agency hires out its talents to block telepathic and paranormal crimes. But when its special team tackles a big job on the moon, something goes terribly wrong, and Runciter is seemingly killed. Now, his mourning employees are receiving bewildering messages from their boss on toilet walls, traffic tickets, product labels, and even U.S. coins.