I didn't know that. It just seemed like a huge plot device, like they ran out of stuff to do in Bon Temps so they just randomly tossed werewolves in (which they never mentioned before) because they were running out of ideas.

Does this season follow one of the books?

the season are pretty much following the books more or less, some stuff is left out some stuff is added (like the vamp jessica) ps the big secret about Sookie is that she has fairy blood in her

And what was the deal with Bill having sex with his maker?! AIn the other books as well?!