Detective Harry Hole is having a rough time. Reassigned, having caused a high-profile embarassment, he finds himself lumbered with surveillance duties. But working alone is just the way Harry likes it and it's not long before he discovers that a rare, high-calibre rifle, a type favoured by assassins, has been smuggled into the country.
When a former WW2 Nazi sympathiser is found with his throat slit, Harry suspects a connection. As his investigation unfolds and the bodies mount up, it becomes clear that the killer is hell-bent on serving his own justice. But who is he? And what is the link to events that took place over 50 years ago? One thing is for certain: he must be stopped.