Glyde, Gonzo, and Azul have one thing in common: they're all flying as flocks of one. Other than his father, Lup , Glyde has never seen a pure Guadalupe petrel, so when he hears of a similar petrel in danger, he implores his father to join him in a daring rescue attempt. Along the way, Glyde is joined by Gonzo, an endangered ivory-billed woodpecker, Zomis, the last remaining passenger pigeon, and a barred owl who speaks only in Shakespearean English. Meanwhile,...