Walking in Darkness is a memoir written by the Auror Alastair Van Harkwood.

The book includes a description of the Patronus Charm:

The wizard must bring vividly to mind his most cherished, happiest memory.
It is extraordinarily difficult for those less talented than myself, and I have never known another man who did not require a mentor before the first silver tracery of his Patronus could be seen.

A copy of the book was given to Alexandra Quick as a birthday gift in March of 2011.


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