These books, Shiver and Linger, are supposedly "the new Twilight" as far as series go. These books still have the fantasy premise of werewolves (no vampires), however, the way the werewolves change, why and when is very different from Twilight.
Grace is a teenage girl that is fascinated with the wolves that live in the woods behind her house. This fascination began when she was a small girl and was attacked by these wolves. She survived and ever since has watched these wolves...one in particular catches her eye, the one with the yellow eyes... Meanwhile, in the woods Sam (the yellow-eyed wolf) watches over Grace throughout the winter. He hasn't stopped watching over her since the day he stopped the others from killing Grace long ago.
In Shiver, the two meet and fall in love, then become determined to find a cure for this werewolf toxin. A toxin that keeps them wolves during cold temperatures and human in warm. I can honestly say, that this book could stand alone. At the end of Shiver, you are satisfied and think everything has been nicely tied up in a bow. However, further drama ensues in Linger that does not fully resolve itself leaving the story wide open for the third book.
I have to say that I didn't get fully invested into this story until about halfway through Linger. I hate saying that because some of my friends absolutely love this series (to date). But, I can say that I am definitely intrigued at this point and will definitely read the third book, Forever, which is scheduled to come out later this year. I want to know how Sam and Grace sew this one up!