An FBI Special Agent is obsessed with bringing down a sociopathic terrorist who, years before, killed his young son in a botched assassination attempt. Driven by vengeance, the agent relentlessly pursues the elusive criminal, who has recently planted a biological bomb somewhere in Los Angeles. The hunt reaches a critical juncture when the terrorist falls into a coma after an airplane crash following their latest confrontation. With the bomb's location unknown and time running out, the agent undergoes a radical surgical procedure to swap faces with the comatose terrorist in the hopes of gaining intel from the criminal's associates.

Disguised as the terrorist, the agent infiltrates his world, connecting with the criminal's associates and ex-girlfriend, trying to piece together the bomb's location. He tries to maintain his cover while enduring the psychological torture of being seen as the man he despises. However, his plan derails when the terrorist unexpectedly awakens from his coma and forces the surgeon who performed the face-swapping operation to swap his face with the agent's. Taking over the agent's identity, the terrorist begins to dismantle the agent's life, entering his home and manipulating those closest to him, all while the agent, trapped in the villain's identity, must find a way to prevent the impending disaster and reclaim his life.