In a city of living bone rising high above the clouds, where danger hides in the wind and the ground is lost to legend, a young woman must expose a dangerous secret to save everyone she loves. Welcome to a world of wind and bone, songs and silence, betrayal and courage. Kirit Densira cannot wait to pass her wingtest and begin flying as a trader by her mother's side, being in service to her beloved home tower and exploring the skies beyond. When Kirit inadvertently breaks Tower Law, the city's secretive governing body, the Singers, demand that she become one of them instead. In an attempt to save her family from greater censure, Kirit must give up her dreams to throw herself into the dangerous training at the Spire, the tallest, most forbidding tower, deep at the heart of the City. As she grows in knowledge and power, she starts to uncover the depths of Spire secrets. Kirit begins to doubt her world and its unassailable Laws, setting in motion a chain of events that will lead to a haunting choice, and may well change the city forever - if it isn't destroyed outright.

"As children, we learned early that the clouds were dangerous. Turns out the city wasn't all that much safer." After the dust settles, the City of living bones begins to die, and more trouble brews beneath the clouds in this stirring companion to Fran Wilde's Updraft. When Kirit Densira left her home tower for the skies, she gave up many things: her beloved family, her known way of life, her dreams of flying as a trader for her tower, her dreams. Kirit set her City upside down, and fomented a massive rebellion at the Spire, to the good of the towers—but months later, everything has fallen to pieces. In Cloudbound, with the Towers in disarray, without a governing body or any defense against the dangers lurking in the clouds, daily life is full of terror and strife. Naton, Kirit's wing-brother, sets out to be a hero in his own way—sitting on the new Council to cast votes protecting Tower-born, and exploring lower tiers to find more materials to repair the struggling City. But what he finds down-tier is more secrets—and now Nat will have to decide who to trust, and how to trust himself without losing those he holds most dear, before a dangerous myth raises a surprisingly realistic threat to the crippled City. In the sky-high city of living bone, to fall beneath the clouds is to be lost forever. But Nat Densira finds more in the grey expanse than he ever expected. To survive, he must let go of everything he believes.

A City of living Bone towers crumbles to the ground and danger surrounds. Kirit Densira has lost everything she loved the most―her mother, her home, and the skies above. Nat Brokenwings―once Kirit's brother long before the rebellion tore them apart―is still trying to save his family in the face of catastrophe. They will need to band together once more to ensure not just own survival, but that of their entire community.