Les Eyzies-de-Tayac is known for three things: pate de foie gras, truffles, and ancient bones. This small French village is home to the largest concentration of prehistoric fossils in Europe and headquarters of the prestigious Institut de Prehistoire, which studies them. So when the local police inspector, Lucien Anatole Joly, finds reason to suspect foul play, he places a call to his old friend Gideon Oliver, the famed "Skeleton Detective," hailed by Publishers Weekly as "shrewd, witty, and self-deprecating," and by the Chicago Tribune as a "likeable, down-to-earth, cerebral sleuth."" "Once Gideon arrives, murder piles on murder, puzzle on puzzle, and electrifying surprise on surprise, in a series of unexpected events that threaten to tear the once sober, dignified institute apart. It takes a bizarre and startling forensic breakthrough by Gideon to bring an end to a trail of deception almost forty thousand years in the making.