The dragons killed her sister, so she devoted her life to killing them. In a world daily invaded by earthquakingly huge dragons, Klara Koskova has a simple dream: take up the mantle of Sentinel and kick some serious dragon butt. However, when a dragon kills her sister, that dream turns into a desperate vendetta. Klara vows to stop at nothing to avenge her... Mikhail Koskov is on the run. His mother has vanished with a dangerous secret, and his employers - the tyrannical Alchemist Guild - have turned their gaze to him. Mikhail must unearth the truth before the Guild finds him. Unfortunately, the only man with answers is in the most secure Sentinel fort in the country. The only way in is to be a Sentinel... but that's nothing a few forged documents won't fix.While Klara and Mikhail fight to survive the Sentinels' brutal training program, the Alchemists search for an excuse to declare war on the Sentinels. If Klara helps her fugitive brother, she'll give the Guild the justification they seek. Klara must choose between the future of her nation, avenging her sister, or saving Mikhail. And she can only pick one...