Grant is an accountant with a bad marriage and a daughter whom he loves. He takes to the road to service his accounts in Las Vegas. While there he meets seductive Marissa. They have a week-long affair which culminates in the arrival of Marissa's ex-boyfriend, Joey. Joey attempts to kill the lovers, but Grant gets the upper hand. Grant and Marissa then drive Joey's body to Zyzzyx Road and Grant buries Joey in the desert there. But in the morning the body is missing and something is trying to kill Grant and Marissa.