Harry Potter and the Prisoner of Azkaban

When Harry loses control over his magic he goes on the run and ends up boarding the Knight Bus- a magical triple decker purple bus- to run away to London.

When Harry is on the Hogwarts Express, he has a bad experience involving a Dementor- one of the guards at the wizarding prison Azkaban- who are trying to find an escaped murder Sirius Black. Sirius Black is after Harry, but his intentions are not what the seem

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