Percy, Leo, and Jason have arrived at Hogwarts--and already, someone is trying to kill them. Could it be the mysterious Sirius Black, who has just escaped from the wizard prison Azkaban? The one who--somehow--has a connection to Percy? Or is something much darker pulling the strings? The six demigods must find out what is behind the monster attacks at the school, evade Sirius Black, and try to fit in without letting Dumbledore know. And why did Dumbledore send that letter in the first place?
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