Night Chills — Dean Koontz

When Paul Annendale arrived in Black River, he expected to enjoy a quiet six weeks of vacation camping in the mountains with his children. Instead he found a nightmare: the town ravaged by a mysterious epidemic of night chills and fever that ordinary drugs didn't seem to cure; old friends and acquaintances behaving in a strange and frightening manner.

Paul did not know then that a powerful mind control drug was turning Black River into a town of robots -- a devastating prelude to a sex-obsessed scientist's dream of controlling the world.

Paul knew only that something was wrong. Terribly wrong. And that he could no longer stand by and watch while the horror spread....