Birdwing by Rafe Martin, a retelling of “The Six Swans”
Once upon a time, a girl rescued her seven brothers from a spell that had turned them into swans. But one boy, Ardwin, was left with the scar of the spell’s last gasp: one arm remained a wing. And while Ardwin yearned to find a place in his father’s kingdom, the wing whispered to him of open sky and rushing wind. Marked by difference, Ardwin sets out to discover who he is: bird or boy, crippled or sound, cursed or blessed. But followed by the cold eye of a sorceress and with war rumbling at his kingdom’s borders, Ardwin’s path may lead him not to enlightenment, but into unimaginable danger.