Grey Diamond

The leader of a chart-topping band is killed in front of his old friend, Elias Harmaa. Elias - or "Herr Grau" as he is also known in Germany - leads the team responsible for the security of the band on their world tour. Now he needs to find the killer. The task is puzzled with a bunch of diamonds found in his friend's possession, but as Elias proceeds with his investigations, he soon realizes that appearances may indeed be deceptive.

After some breath-taking events in Munich and Bonn, Elias finds himself and his team life-saving the family of his killed friend at Finnish lake district, dodging bullets and trying to survive.

Rapidly changing actions do not slow Elias down in investigating why his friend had to be killed. And who are the people behind the murder?