God of clocks

"War, rebellion, betrayal - but the worst is still to come. For in the cataclysm of the battle of the gods, a portal to Hell has been opened, releasing unnatural creatures that were never meant to be and threatening to turn the world into a killing field. And in the middle, caught between warring gods and fallen angels, humanity finds itself pushed to the brink of extinction. Its only hope is the most unlikely of heroes. Former assassin Rachel Hael has rejoined the blood-magician Mina Greene and her devious little dog, Basilis, on one last desperate mission to save the world from the grip of Hell ..."--Publisher description.