As international terrorism stalks the city of Edinburgh, a small time crook stumbles upon a body 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 is feverish as the city prepares for a rally to celebrate the return of Pope John the 25th to his home town With the whole world watching, the security has to be bulletproof But is there a chink in the armour and does Bob Skinner have the inner strength to find the answer to the biggest question of all?