The Redeemer Nesbo Jo (2015)

It is a freezing December night, and Christmas shoppers have gathered to listen to a carol concert. Then a shot rings out and one of the singers falls to the floor, dead. Detective Harry Hole and his team are called in to investigate, but they have little to work with: there is no immediate suspect, no weapon and no motive. When the assassin discovers he has shot the wrong man, Harry finds that his troubles have only just begun.