Escaped killers led flee a Nevada prison to the ghost town of Yucca Flats, even though a nuclear blast is set to detonate there at 6 a.m. the following morning. Drawing a hapless group of passersby into their circle of desperation, the killers hold court over a night of suspense and terror.

Easygoing Jason Sweet won a trainload of sheep in a poker game and aims to graze them. Powder Valley looks like the perfect place. A cattle baron and a woman try to come between Jason and his sheep.