The book starts out with a description from the main character Vivian, a sixteen year old werwolf. She explains about her father, the old leader of the pack, and the group called the Five. The Five consist of Rafe, Finn, Willem, Ulf, and Gregory.
They are the only pack members of Vivian's age and their group used to include another boy called Axel. In their old town, the Five started to become more feral, using their wolf forms to scare humans. Vivian was afraid they might betray the pack's secret, but in the end it was Axel who lost control.
Axel killed a human girl and someone saw him change back from his wolf form to human after he did it. When Axel was in prison, the Five killed another human to make it look like the "real" killer was still loose, and he was released. Vivian's father killed Axel for endangering the pack, but she pleaded with him to let the Five live. Not long after, a group of suspicious neighbors set fire to the pack's house.
Now a year later, Vivian starts high school in the new town, where she has no friends because of her reserved and secretive nature. Many girls she attends school with find her intimidating and are jealous of her beauty. To find out the rest you need to read the book....