Stay of Execution by Quintin Jardine

What the cover says:
Evil stalks the city of Edinburgh. This time the threat is bigger than the crooks, scam-artists or drug dealers who find their prey in the shadows of the streets. Some people are looking for a big-time hit.
It starts small. The body of a respectable businessman is found hanging from a tree; a veteran from a Belgian marching band is killed in a hit-and-run incident and another dies of an apparent heart attack. Excitement on the streets of Edinburgh is feverish as the city prepares for a huge rally to celebrate the return of Pope John the 25th to his home town. The security has to be bulletproof. But is there a chink in the armour and does DCC Bob Skinner have the inner strength to find the answer to the biggest question of all?

An interesting idea and beautifully written as you would expect from Jardine. Apart from getting me totally confused with the departmental reorganisation at the beginning, it keeps you guessing right to the end.

8/10