Wizard in the Basement, Witch with the Key

The war is over, and Hermione claims her potions master as a spoil of war - and to save him from Azkaban. He's still a prisoner awaiting trial, though, even if he is bound in the house Hermione, Ron, and Harry share instead of the wizard prison. The Ministry fits him with an anti-magic collar, leaving Hermione to hold the end of his (only somewhat metaphorical) chain.