The Leopard (Harry Hole #8) by Jo Nesbø (Jo Nesbo)

In the depths of winter, a killer stalks the city streets. His victims are two young women, both found with twenty-four inexplicable puncture wounds, both drowned in their own blood. The crime scenes offer no clues, the media is reaching fever pitch, and the police are running out of options.

There is only one man who can help them, and he doesn't want to be found. Deeply traumatised by The Snowman investigation, which threatened the lives of those he holds most dear, Inspector Harry Hole has lost himself in the squalor of Hong Kong's opium dens. But with his father seriously ill in hospital, Harry reluctantly agrees to return to Oslo. He has no intention of working on the case, but his instinct takes over when a third victim is found brutally murdered in a city park.