AllMovie

A chartered bus transporting a group of female convicts turns out to have another "passenger" when a severed arm flies out from under the vehicle. In the ensuing investigation, the mangled body of a woman is found tied to the undercarriage of the bus. At first, it appears that the woman was the victim of a bungled escape attempt, but the CSI members are soon led down a different trail of evidence. Elsewhere, a gambler finds himself on the business end of a knife, suffering one fatal wound in the front of his body, four in his back -- and all from the exact same angle of attack.