From the best-selling author of My Sister the Vampire comes a brand new paranormal romance for young girls.

To their classmates, Daniel and Justin are identical twin brothers.

But in fact they couldn't be more different. On their thirteenth birthday, one is destined to turn into a werewolf ...!

This full moon is going to change everything. Will Riley and Debi find out the boys' secret? And what will happen to the band? Cry Wolf! is the first fun and exciting story in the new spin-off series, My Brother the Werewolf.

Sienna Mercer's young and innocent werewolf stories are perfect for 9+ girls who aren't quite ready for teen paranormal romance.

It's High School Musical meets Camp Rock; the ideal book for girls who love to read.