Second half of the story. massive spoilers ahead.
For instance, it opens with a cheerful and happy land where the Meadow Mouse decides to go see the Owl. There is someone there named the Sad Princess, who has lost her name. (Which the reader can deduce.)
Meanwhile, for the rest -- a strange man, coming from shadows, gets news from Emily and breaks Azrael's spells; she takes her second husband and runs -- straight out of the story. Raven is in prison, and Pete and Lemuel prisoners because of their crippling injuries. But Raven, having naturalized and studied for it, knows what the man from centuries ago, who had him thrown in prison, about civil rights and all that. And Pete gets some help from the mouse, learning some things about the magical weapon he took up.
It rolls on from there, involving Wendy's mother, two chariots pulled by atypical animals for that purpose, the use of an atomic bomb, pirate radio stations, Galen's remembering some prisoners, help in getting to a Titan, a lot of beings with several names out of myth, legend, and folklore, and more.