Phantoms - Dean Koontz

"Phantoms is gruesome and unrelenting.It's well realized, intelligent, and humane."—Stephen King
They found the town silent, apparently abandoned. Then they found the first body, strangely swollen and still warm. One hundred fifty were dead, 350 missing. But the terror had only begun in the tiny mountain town of Snowfield, California.
At first they thought it was the work of a maniac. Or terrorists. Or toxic contamination. Or a bizarre new disease.
But then they found the truth. And they saw it in the flesh. And it was worse than anything any of them had ever imagined...