Unhappily married Richard Mason concocts a meticulous scheme to kill his shrewish wife so that he'll be free to marry her sister.

Gabby, the waitress in an isolated Arizona diner, dreams of a bigger and better life. One day penniless intellectual Alan drifts into the joint and the two strike up a rapport. Soon enough, notorious killer Duke Mantee takes the diner's inhabitants hostage. Surrounded by miles of desert, the patrons and staff are forced to sit tight with Mantee and his gang overnight.

A screenwriter with a violent temper is a murder suspect until his lovely neighbor clears him. However, she soon starts to have her doubts.