Fortress operative Adam Walker knows hardship and pain, specializes in navigating behind enemy lines, and never leaves a man behind. When the Special Forces Marine is asked to rescue a woman who helped save him, he doesn't hesitate to lay his life on the line to return the favor. Although Adam believed his past was buried, he learns the enemy has risen from the ashes. Danger stalks not only Adam, but the people who mean everything to him, including the woman he loves. To destroy his nemesis for good, the Marine must take Veronica into the enemy's lair.

DEA Agent Veronica Miles is used to working alone in enemy territory for weeks at a time. But on this mission, something goes horribly wrong, and she's taken captive. Held prisoner for days, Veronica is rescued by an operative she once aided but returns home to suspicion and accusations from her co-workers. Forced to surrender her badge and weapon, Veronica has no one to turn to except the man who saved her life. Together, she and Adam will have to face their worst nightmares and defeat a foe obsessed with revenge. This time, failure will be fatal.