When a Neanderthal hunter is killed, the police are quick to label it a 'hunting accident' and absolve the meat packing company of any wrong doing. But the hunter's mate is convinced that there is something more to it and she hires a Cro-Magnon private detective, Thud, to look into the circumstances. Thud quickly discovers a number of facts that don't add up, and as he gets deeper into the case, his own life seems to be in danger. The suspects start...