A roguish reporter becomes the prime suspect in a murder while investigating the theft of an art collection belonging to his girlfriend's missing father.

In the future, Saturn's moon of Titan houses a prison where Earth's worst criminals are kept. One of those criminals, Python Diamond, is being flown back to Earth, escorted by five members of the military police. Upon their return to Earth, they find that a cataclysmic nuclear war has reduced the world to a near-lifeless husk.