Brimstone Angels — Heather Fleming

The lines have been drawn. Sides have been chosen. The seal is breaking. Every challenge since Eden first discovered her powers has led her to this. For her, it is now a race against time, to lead an invading force into the demon realms, to find and destroy the demon emperor. Meanwhile, her father, brother, and best friend rush to replace the seal - an act that will either force Eden to end her mission in failure or trap her in hell. Sacrifices must be made. Lives will be lost. And at the end of it all, Eden must face the bleak truth - that heroes don't always get happy endings.