What happened to the peaceful ancient Pueblo civilization of the American southwest? For 1000 years, the Anasazi -- a democratic people with rich achievements in architecture, agriculture, astronomy and art -- flourished in what is now New Mexico. Yet around 1200 A.D., something brought their utopia to a sudden and mysterious end. Paleo-anthroplogist Christy Turner has found what he believes are clear signs of cannibalism among the Anasazi ruins, but American Indian groups and other archaeologists are skeptical. And while the evidence is difficult to refute, the meaning of the findings is still open to debate. In the shadow of a debate both scientific and political, question remain: Did the Anasazi culture become cannibalistic, or did cannibals from afar stumble across the perfect victims? (UK/PBS 55 min)