When Harry left Oslo again for Hong Kong - fleeing the traumas of life as a cop - he thought he was there for good. But then the unthinkable happened. The son of the woman he loved, lost, and still loves is arrested for murder: Oleg, the boy Harry helped raise but couldn't help deserting when he fled. Harry has come back to prove that Oleg is not a killer. Barred from rejoining the police force, he sets out on a solitary, increasingly dangerous investigation that takes him deep into the world of the most virulent drug to ever hit the streets.

Oslo in November. The first snow of the season has fallen. A boy named Jonas wakes in the night to find his mother gone. Out his window, in the cold moonlight, he sees the snowman that inexplicably appeared in the yard earlier in the day. Around its neck is his mother’s pink scarf. Hole suspects a link between a menacing letter he’s received and the disappearance of Jonas’s mother - and of perhaps a dozen other women, all of whom went missing on the day of a first snowfall. As his investigation deepens, something else emerges: he is becoming a pawn....

Two young women are found murdered in Oslo, both drowned in their own blood. Media coverage quickly reaches fever pitch: Could this be the work of a serial killer? The crime scenes offer no coherent clues, the police investigation is stalled, and the one man who might be able to help doesn't want to be found. Traumatized by his last case, Inspector Harry Hole has lost himself in the squalor of Hong Kong's opium dens. Yet when he is compelled, at last, to return to Norway - his father is dying - Harry's buried instincts begin to take over. Then a female MP is discovered brutally murdered.

For years, detective Harry Hole has been at the center of every major criminal investigation in Oslo. His brilliant insights and dedication to his job have saved countless lives over the years. But as the killer grows increasingly bold and the media reaction increasingly hysterical, the detective is nowhere to be found. This time, when those he loves and values most are facing terrible danger, Harry is in no position to protect anyone—least of all himself.

When the Norwegian ambassador to Thailand is found dead in a Bangkok brothel, Inspector Harry Hole is dispatched from Oslo to help hush up the case. But once he arrives Harry discovers that this case is about much more than one random murder. There is something else, something more pervasive, scrabbling around behind the scenes. Or, put another way, for every cockroach you see in your hotel room, there are hundreds behind the walls.