Gates by G.S. Luckett

A death row inmate, known as The Brit, on an isolated island is able to escape from his execution during a freak thunderstorm. Now, he finds himself fighting his way through the prison and protecting the very people who jailed him. Pursued by prisoners and guards that will not die and a mysterious inmate from his nightmares, The Brit has to lead the others to escape in order to save their souls and possibly his own. This is the first installment of a series where we find out how, The Reaper, is chosen and that he does more than shepherd lost souls. He maintains the balance between Heaven and Hell, that is threatened to be destroyed by an ongoing war.