Alive Or Dead (2008)

A suspicious-looking abandoned school bus causes passer-by Maria to stop her car and investigate. Maria first finds a lone girl, and then she finds a stomach-churning display in the back in the back of the bus. Then the killer finds her. Revisiting the scene of the crime, this strange-looking man takes Maria and the girl, who are now helplessly trapped on the bus, on a ride to an utterly bizarre desert location. The girls must quickly figure out whom--including each other--they can trust if they hope to make it out of the desert alive