I don't really have a real synopsis so here goes;
Eric Vilanova is evil, or at least sees himself that way. So when he dies and gets sorted into the Above (Heaven), he's pissed. But he makes friends with his patron Julia and promises to at least try to act good. Now Eric is caught up in a revenge plot to take out the corrupt leader of the Afterlife; Acelin. But when Acelin offers him a position on the dark side, he has to make a choice; his evil standing, or his new friends.
^See I'm still tweaking it a little.