When a dangerous terrorist strategist escapes from custody, the CIA's top-secret underground prison triggers a total lockdown, triggering a countdown to the complete destruction of the citadel by combat drones. Acting bold and brutal, the criminal quickly takes out anyone trapped with him in these endless labyrinths. Analyst Abby has a score to settle with the "demon", so she not only needs to survive but also to figure out how to get revenge on her worst enemy. An unpredictable cat-and-mouse game begins.