Professor Bryan Sykes, the world's leading expert on human genetics, set a goal to locate and analyse as many DNA samples as possible with links to the yeti. In doing so, he found himself entering a strange world of mystery and sensationalism, fraud and obsession and even the supernatural. Protected by the ruthless vigour of genetic analysis he was able to listen to the stories of the yeti without having to form an opinion. The only opinion that mattered was the DNA. Three hair samples from the miogi, the Bhutanese yeti are the cause of the investigation. The hairs did not surrender their secrets easily, but eventually two were identified as known species of bear. The third remained a mystery. One of the many theories to account for the yeti legend is that there were small groups of Neanderthals that had managed to survive until recent times. If so, would it be possible to detect recent interbreeding between our own species and Neanderthals in the genomes of indigenous people living in remote regions? Professor Sykes has made some surprising and significant discoveries. Discoveries that could change our understanding of human origins.