After a mysterious attack in the inner city, resulting in weakened protective borders, A lonewolf member of the Clerics believed to be blessed by God with their abilities goes on a spree to find out who was involved to stop the attackers from invading the city.

I need more of an idea of place here. You mention the inner city, but the clerical reference sounds paranormal? Is it post-apocalyptic?

If they have already attacked the inner city, how are they not already in the city?

I'm just going out in a limb here. Think this is what's going on -
?A member of a secretive group called the Clerics must defend his city from an attack by (insert group/force) using (his special power of...).?