Perfect regret

Edinburgh is paralysed by deadly bombings. Casualties number in the dozens and even the police department will not spare a death. However, Chief Inspector Ava Turner and Inspector Luc Callanach must not allow the personal losses they have suffered to prevent them from tracking down the culprit. How is it possible that he leaves no trace and is always one step ahead of them? Ava and Luca have no choice but to continue walking towards the trap that is about to destroy them. The most explosive case of their careers is about to begin.