Ubik

Glen Ruciter is dead. At least, someone died in that explosion on Luna and it's Runciter whose funeral is taking place in Des Moines. But, if he's dead, why are his employees receiving puzzling and sometinmes downright scatological messages from him ? And why is the world around them warping and changing in ways that suggest that it's their time that's running out ? Maybe Glen Rucinter isn't dead.
Maybe it's everybody else...