A Navy navigator is shot down over enemy territory and is ruthlessly pursued by a secret police enforcer and the opposing troops. Meanwhile his commanding officer goes against orders in an attempt to rescue him.
John McClane travels to Russia to help out his seemingly wayward son, Jack, only to discover that Jack is a CIA operative working undercover, causing the father and son to team up against underworld forces.
Coming together to solve a series of murders in New York City are a police detective 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.