Feathers fly in this conclusion to the Skybound Saga trilogy. The war between earth and sky continues as hundreds of ghost eagles terrorize the Six Villages. Pieced-together nets and caves offer some protection, but the Six Villages have become overcrowded. Enemies are trapped in the same metaphorical cage, fighting for food and territory as Uztari society verges on collapse. Though everyone seems to be a pawn or prey in the ghost eagles' game, twins Kylee and Brysen are at the center of it all. The birds communicate with the siblings through nightmares and visions, eventually leading them to find the giant egg of a black eagle. Brysen wants to protect it. Kylee wants to destroy it. Whoever gets their hands (or talons) on it, will it really bring an end to this war? Following the battle-heavy Red Skies Falling (2019), this final entry effectively ties up many of the loose threads while maintaining a constant wingbeat of danger and intrigue. As in previous books, London's omniscient third-person narration glides in and out of characters' heads to keep the intricate plot moving. Readers expecting compelling character arcs may come away disappointed, as the twins start to feel like broken records. The biggest disappointment, however, is the ending. While the revealed fantasy history draws strong emotional parallels to real-life history, the conclusion ultimately nose-dives into mixed messages about justice. A skittering end to an ambitious series. (Fantasy. 13-18) Copyright (c) Kirkus Reviews, used with permission.