The Black: Evolution

After fleeing the doomed oil rig Leaguer and the creature that destroyed it, Shawna Sigler and Catfish are rescued by a shadowy government agency. Upon discovering that samples of the M2 substance have survived, they agree to join a classified project to study the creatures and find a way to destroy them.

Ensconced in a secret underground lab, Shawna and three scientists who survived the events at HAL study the creatures while Catfish develops new weapons. Shawna realizes a troubling trend as the experiments progress: the M2 samples are evolving.

Tying together the first three books, The Black, Arrival, and Outbreak, The Black: Evolution adds to the M2 mythos and leads to a fiery conclusion.