When Becca transfers to a high school in an elite San Francisco suburb, she’s immediately adopted by the most popular girls in school. Marley, Arianna, and Mandy are perfect. But before too long, at a party under a full moon, she learns that they also have a big secret. Becca’s new friends are werewolves. Their prey? Slimy boys who take advantage of unsuspecting girls. Eager to be accepted, Becca allows her friends to turn her into a werewolf and finally, for the first time in her life, she feels she truly belongs. But things get complicated when Becca accidentally kills Arianna’s predatory boyfriend, and the cops begin searching for a serial killer. And as their pack begins to buckle under the pressure—and their moral high ground gets muddier and muddier—Becca realizes that she might have feelings for one of new her best friends.