Late one balmy summer evening in Pyongyang, an important Chinese intelligence general on his way to a secret meeting with Kim Jon-Il is assassinated in plain sight of a surveillance camera. The two shooters are wearing the uniforms of North Korean police officers.

Kim Jong-Il denies any knowledge of the shooting, but the Chinese do not believe him. As they prepare to attack, Jong-Il promises to unleash his nuclear weapons on downtown Beijing, Seoul, and Tokyo, plunging the entire region into nuclear war.

Kirk McGarvey, just off a difficult assignment that took him to Mexico City, has...