The Red Breasted by Jo Nesbo
Norwegian author Jo Nesbo offers up a smart police story that deals with a modern crime that stems from incidents that originated in 1943 in Leningrad during the German offensive. When a mistake causes an international incident during a US Presidential visit to Norway, Detective Harry Hole is placed out of sight in the Federal Police Department, until matters settle. Unable to sit still and coast, Harry investigates Neo-Nazis and comes across the someone who has been target practicing with an exotic rifle that would only be used to assassinate someone.
This story is a puzzle with a bunch of missing pieces until
the last pages and you cannot tell if Harry will stop the killer or not from
fulfilling his ultimate plan.
Jo Nesbo has an entire series, and I will definitely watch
for more.