"We made a promise, remember? To save everyone. Back then, we were too young. When we were older, we were too weak. Now? Now there's nothing in my way and nothing left to lose."A young doctor exploring the world, a prodigy searching for her place in the world, and an orphan hunting for clues about her father's murder. Their journeys converge on a job granted by a mysterious benefactor that will entwine them in a world of subterfuge where the future of the world hangs in the balance.