The Journey, by Kathryn Lasky, was published in 2003 by Scholastic. It is the sequel to The Capture.
It began as a dream. A quest for the Great Ga’Hoole Tree, a mythic place where each night an order of owls rises to perform noble deeds. There Soren, Gylfie, Twilight, and Digger hope to find inspiration to fight the evil that dwells in the owl kingdom. The journey is long and harrowing. When the friends finally arrive at the Great Ga’Hoole Tree, they will be tested in ways they never dreamed of. If they can learn from their leaders and from one another, they will soon become true Ga’Hoolian owls—honest and brave, wise and true.