Return to Oz: The Falken Chronicles, Book 3 (Unabridged‪)‬

Falken survived the ordeal on Olympus, only to be stunned with a shocking revelation: his good friend Weaver is still incarcerated on Oz. The only way to get Weaver out is to volunteer to go back inside the prison himself. But the clock is ticking - Falken will only have a few days to find his friend and help him escape. While he's back on Oz, he'll have to follow the rules to the letter. One step out of line, and they'll both be stuck in jail...forever.