He’s the Guild’s most esteemed captain, determined to keep the world safe. She’s a coldhearted assassin, fueled by vengeance. Between them is a gulf of bad blood that will forever warp their destinies.  But destiny has a strange way of altering its course. When the Heretics—an unstoppable alien horde—threaten the advanced civilizations of the Cloud Passage Alliance, an international coalition spanning the globe, Garrick is the first to rise in defense. As a member of the Windbreaker Guild, a specialized military branch of Aerokin—people with the rare power to control acro-buoyancy, a mysterious energy source—he leads the charge in a desperate fight for survival.   As Garrick takes on the Heretics, his most daunting challenge is closer to home: Liden Ahngo, the temperamental former assassin forced into the Guild’s ranks. Bound by their shared duty but torn apart by their past, their mutual enmity threatens to undermine their mission.   As the world teeters on the edge of extinction, Garrick and Ahngo must find a way to bridge their deep-seated animosity. Who knows, if they can work together long enough to defeat the Heretics, perhaps they can also achieve the seemingly impossible—forgiveness.