Lark has fled Northaven with her mother and is urgently seeking a safe haven. Nightingale is being held captive and forced to use her songlight against her own people. Piper has been promoted up the ranks, where nothing but bloodshed is demanded of him. Rye has stumbled across an incredible airship, the likes of which has never been seen before. . . .

All four are united by their desire for peace. But peace between them feels more fragile than ever.