The Gathering Storm, 1

"Mack, Fiona, Darren, and Gabriella aren't exactly friends at their middle school--in fact, they couldn't have anything less in common. But when they start developing powers, including the ability to transform into mythological animals, they find out that they are Changers, a magical line of shapeshifters that history has forgotten. But there's little time for questions. A powerful warlock is racing toward their town, destroying everything in his wake. Can Mack, Fiona, Darren, and Gabriella harness their newfound powers in time to save their home? Can they even stop arguing before the last bell?"--Amazon.com.