Cactus for Christmas? Forensic psychologist Gen Ziegler needs to move from Tucson to Pennsylvania during the winter semester break. She and her twin sister, Sara, decide to use the move as an excuse for a much-needed vacation. They plan to drive across the country, seeing the sights while getting reacquainted after years of not speaking to each other. Still, jumping back into a family relationship isn't easy. To make matters worse, they're stranded in a tiny West Texas town only four days before Christmas. Sure, the scenery's gorgeous, the Tex-Mex food is delicious, and the residents are friendly enough, but the town seems filled with secrets . . . and a killer's on the loose.