Nesbo, Jo : The Leopard

Harry Hole is back and this time he's back from very, very far away. Another gripping instalment in this prize-winning and acclaimed series by the internationally #1 bestselling crime writer in Norway.
Two women are found murdered in Oslo -- both of them have drowned in their own blood. What mystifies the police is that the puncture wounds in the victims' faces have been caused from the inside of their mouths. Kaja Solness from Homicide is sent to Hong Kong to track down a man who is the Oslo Police Department's only specialist on serial killings. The severely addicted detective has tried to disappear in the vast, anonymous city. He is on the run and haunted by his last case, the woman he loves, and creditors alike. His name is Harry Hole.