Before Scorpius, Tace Justice was a good ole Texas cowboy. After, the world became dark, dangerous, and deadly—and so did he.

The Vanguard medic is stronger, faster, and smarter than before, but he's lost the line between right and wrong. When he focuses his absolute passion on one woman, there's no turning back for either of them.

Sami Steel has been fighting to survive right alongside Tace. In truth, she's a former hacker turned government agent who alone knows the location of The Bunker, where scientists stored both contaminants and cures. When sexual fire explodes between her and Tace, she'll face even that hell again to save him.