Harry Potter and the Prisoner of Azkaban
by J. K. Rowling
In the third Harry Potter book, (among other things) Harry’s friend Hermione uses a
time-turner amulet to travel short distances in time so she can attend more classes, and
the device also proves useful when Harry and friends must rescue Sirius and Buckbeak.
Mysterious thing, time. Powerful. . . and when meddled with,
dangerous.
Harry Potter and the Prisoner of Azkaban by J. K.
Rowling (Bloomsbury, July 1999).