Red, Red Wolf

Stiles turns into a werewolf on his 13th birthday. He wasn't bitten one, and he wasn't born one, he was destined to be one.

But, the thing the about destined werewolves that nobody knows what they are.

Now he's 17 and there's evil in Beacon Hills and the whole pack gets ambushed and kidnapped, even Allison because of her hunter status.

The only one they didn't get is Stiles, because he's so obviously human, except he's not, but nobody knows that, so it's up to Stiles to save them.