This book was a powerful, thrilling addition to the young adult fantasy genre. Wilson does an amazing job of starting with the action and the complex and interesting main character Skye is immediately thrown into a rich world populated with Lycans, shapeshifters, and an evil Covenant. But even with all the action, Wilson understands how to write the soft, tender moments that really make stories shine. The relationships between the characters are incredibly developed, especially Skye and Thirteen's relationship, which had exactly the right pacing. This is a book that you will truly find impossible to put down.