Alpha Wolf by Amy Green

Alison Masterson has been in love with werewolf Brody Donovan since she was twelve years old. Now he’s the alpha of the Donovan pack, and she’s just a waitress at the local diner, dreaming of the man she can never have. Until the night she accidentally discovers his secret.
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Brody Donovan has never noticed the pretty redhead who would do anything for him. But now he needs her to keep a secret—and he’s starting to realize she’s his mate. The problem is, he can’t deserve her. Because Shifter Falls is about to enter into a dangerous war with humans. And the secret Alison knows is only the beginning of his terrible past…