Coming together to solve a series of murders in New York City are a DEA agent whose family was slain as part of a conspiracy and an assassin out to avenge her sister's death. The duo will be hunted by the police, the mob, and a ruthless corporation.
When an Amacor oil rig in the Gobi Desert of Mongolia proves unproductive, Captain Frank Towns and copilot "A.J." are sent to shut the operation down. However, on their way to Beijing, a major dust storm forces them to ditch their C-119 Flying Boxcar in an uncharted area of the desert.
Iconoclastic, take-no-prisoners cop John McClane, finds himself for the first time on foreign soil after traveling to Moscow to help his wayward son Jack - unaware that Jack is really a highly-trained CIA operative out to stop a nuclear weapons heist. With the Russian underworld in pursuit, and battling a countdown to war, the two McClanes discover that their opposing methods make them unstoppable heroes.