Stormfall by John Hegenberger

In October 1959, a young, hard-luck PI is lost in America, determined to untangle a series of grisly murders spreading like a disease from the set of The Alamo. Fighting for his life—from a dry desert storm, to a mind-bending fog in San Francisco, and a snow-blinding mountain top outside Hollywood—LA PI Stan Wade gropes his way through drug-induced false trails, trying to outwit an aggressive, obsessive mass murderer.