The Damned — Joseph Sweet

In a desperate bid to save his sister's life, Marcus becomes trapped in the underworld, forced to watch helplessly through the eyes of a shape-shifting demon as it begins to systematically destroy all which he holds dear just to torment him. With time running out, the promise of possible escape looms on the horizon, but how far will he go to free himself and save those he cares about? How far would you go? And would the price be more than you could bear?