T
ime-Turners
A Time Turner may be used for short-term time travel. Hermione receives a Time-Turner from McGonagall in Prisoner of Azkaban, so she could attend more classes than time would normally allow. Hermione is ordered to keep it a secret from everyone, including Harry and Ron, although they do notice the suspicious impossibility of her schedule, and several bizarre disappearances and reappearances. Hermione lets Harry and Ron in on the secret near the end of the book, when she and Harry use the Time-Turner to save Sirius and Buckbeak. Feeling the strain from her heavy course load, she finally returns the device to McGonagall.
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