When Jules Grace comes face to face with the physical embodiment of Hell itself, she sees a reflection of her own tortured soul. As a bounty hunter on the planet Sierra, Jules knows tracking down the most elusive and powerful creature in the universe will set her up for life and possibly quell her own inner demons for a while with the distraction of the hunt. What she doesn't count on is meeting Ethan Knight, Commander of Empress Anna Devereaux's War Angel contingent from Earth who have vowed to track Helena down before it's too late. Ethan is determined not to fail his fellow War Angel, Cade, a second time and is on a personal mission to save his friend's last gift to the world by any means necessary. Unfortunately for Ethan and the other War Angels, Helena refuses to listen to reason and is determined to keep the one and only physical reminder she has left of Cade. Jules understands Ethan's deep set desire to honor his friend, but she also comes to realize how much Helena has already lost and is sympathetic of her plight. Caught in the middle of a fight that will undoubtedly have a violent resolution, Jules follows her heart and tries to make each side remember how delicate and precious life is, especially one that the universe has never seen before or ever will again.