Sam Foster has just started his first week as a security guard at CryoArk, a research company operating a classified bunker under the Arizona desert. He has already learned something deeply unsettling: the company is running illegal DNA splicing experiments on human subjects, and he has been told he cannot leave or talk. Then one of the experiments escapes. Screams and tearing sounds reach his office. The lockdown triggers. Three days later, his supplies are gone and the safety of his room is no longer enough. Sam must face what is out there.