Immortal Clay by Michael Warren Lucas
Duplicate. Infiltrate. Exterminate.
The alien ate its way out of Antarctica, devouring and duplicating every living thing it found. Humanity turned continents to glass and oceans to poison in a desperate effort to stop it—and failed.
Nobody expected that once the alien copied everyone, once it owned the world, it would set the copies free.
Police detective Kevin Holtzmann fled with his family into the desert, and almost survived. Now a new Kevin must figure out the terrifying new world’s rules before the world eats him alive—again.
Good thing he’s a new Kevin.