The Deathly Hallows

"There were once three brothers who were travelling along a lonely, winding road at twilight. In time, the brothers reached a river too deep to wade through and too dangerous to swim across. However, these brothers were learned in the magical arts, and so they simply waved their wands and made a bridge appear across the treacherous water. They were halfway across when they found their path blocked by a hooded figure..." http://harrypotter.wikia.com/wiki/The_Tale_of_the_Three_Brothers

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