Humans start mutating into aliens in this taut science-fiction thriller. The cause: Small rocks falling from the sky, which trigger a virus latent in every human being. The virus causes alien transformation, and it spreads fast. A group of scientists are running out of time in their attempt to save the world. They have an antidote, but can they administer it before the human race is overrun Find out in INVASION, written by Robin Cook (COMA, OUTBREAK, VITAL SIGNS).