How does the prisoner of azkaban end?

Answer:
What a spoiler question! Harry and Hermione help Sirius escape (Ron was in the hospital wing) with the help of a time turner that Hermione got so that she could take more than a full load of classes. In the process they also save Buckbeak, the hippogriff, from being executed by the Ministry of Magic.
Contributor: Flapperdiddledoo
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