Set in Perth, Western Australia, a has-been SAS soldier, Al Connor, divorced and out of luck, is called back to join a secret elite group called SAD (Seek and Destroy). He was one of the best but now finds himself expendable. Outnumbered and against all odds, he battles for survival against a fierce alien presence that is very unpredictable. In the turmoil, he finds true love and adopts a child left by the alien's carnage. He faces the thought of his own mortality and of his newfound family. He is confronting a life-and-death situation every time he faces the aliens. He has to balance his everyday life and the savagery of the aliens in a spasmodic and sometimes impossible dilemma.