In the 24th century, survivors of a nuclear war live in a domed city where they are allowed to stay alive only until age 30. "Runners," who refuse to die in the extermination ceremony known as Carousel, are hunted down and killed by enforcers called Sandmen. Logan is a Sandman who's begun to question the system, and he and a woman named Jessica leave the city to look for a mysterious place called Sanctuary. Along the way they meet an android named Rem, who joins them in their quest. The three of them are being pursued by a Sandman named Francis.

A hunter who prefers human prey to animal captures Francis, Logan and Jessica.