Maisie feels like she's drowning in her family's world of magical gifts and dangerous purpose. She doesn't have their gifts, but she's still expected to help combat the spread of Flight, a substance that grants temporary magic with a nasty side effect: the uncontrollable urge to kill. After nearly dying during a Flight raid gone wrong and learning her father hid key information, Maisie reaches her limit. Time to stop being swept along and start investigating the secrets that make stopping Flight the family obligation. Her leads point to the event that propelled her father to fame thirty years before-and make her the target of dangerous magic users who would keep Flight's true nature buried at all cost. Under attack, she finds unexpected refuge with the older brother who made her childhood hell. Their new relationship promises the familial acceptance giftless Maisie has always longed for, but Flight's architects want her dead... and Flight, perhaps more than a lifeless substance, wants her mind.