Mapping the minds of murderers is what Dr Tony Hill does better than anyone So when a twisted killer starts targeting psychologists across Northern Europe, he's the obvious choice to track the executioner's mental and physical journey Except he no longer wants to delve into the minds of serial killers Soon, however, the case comes too close to home The next victim is a friend of his Hill's former partner, DCI Carol Jordan, is herself in Germany, working undercover in a world where human life is cheaper than a drugs deal She needs his help as much as the hunters of the killer