Jua Wu is one of the CIA's most skilled undercover operatives—sharp, adaptable, and able to disappear into any environment. But when a covert mission in Thailand to thwart a worldwide biological terrorist attack goes sideways and her partner is taken captive, Jia barely escapes with her life. The bigger problem? Her location was leaked, and there's only one explanation: Someone inside the agency betrayed her. With her trust in the CIA shaken, Jia turns to the one man outside the agency who might help.

Erik is a guardian whose job it is to protect intelligence assets from threats too dangerous or too compromised for official channels, so when Jia calls on him for backup, he doesn't hesitate. The plan is straightforward: They'll travel to Singapore, infiltrate the world of a criminal mastermind, and rescue the captured operative. But as the line between professional and personal becomes increasingly blurred, Erik and Jia's path forward becomes anything but simple. The clock is ticking for millions of health-compromised civilians around the world as Jia and Erik confront a terrifying truth—the traitor they're chasing may be closer than they think.