Alternate Character Interpretation: Grace and Sam are supporting protagonists. They spend most of each book ignoring their problems. Most of the major conflicts in the series thus far are resolved by others, most notably Isabel. In Shiver, she comes up with the idea to cure lycanthropy. In Linger, she's instrumental in helping Cole find eventual redemption by saving Grace's life.
Moral Event Horizon: Sam's parents slashed his wrists in the bathtub in hopes of killing him since he couldn't control being a werewolf.