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Set in an alternate universe in which Peter survived the Hale fire intact, but still psychopathic, and took a recently-orphaned Stiles under his wing. Result: An ultra-violent young werewolf with considerable moral deficiencies.
Derek doesn't know about any of this, of course, because he left Beacon Hills a long time ago, when he realized that he wanted no part of his uncle's crazy vendetta against humankind.
But now, a boy named Stiles turns up in Derek's hideout in New York, ostensibly to recruit him for Peter's pack.
The truth turns out to be something else, entirely.