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?
The Packer twins are getting good at this werewolf thing. The only trouble is, Daniel is the werewolf, but Justin is the one who's good at it. So Daniel concentrates on winning the Battle of the Bands with his group, In Sheep's Clothing. But when his lyrics go missing and the band's dreams of their first gig are shredded. And what will Debi do if she works out the song is about her? Meanwhile Justin totally does not want to win homecoming king. Stuck up cheerleader Mackenzie Barton is sure to get voted queen, and the only person Justin could dance with in front of everybody is Riley - but Riley doesn't even know he exists!
Justin and Daniel are in a spin, Justin's begun taking dance classes with his girlfriend, Riley. But if the football team find out, he's sure he'll be dead mean. Meanwhile, Daniel's really happy with Debi - but her dad is super-suspicious of him, and completely convinced that werewolves exist! Can Daniel throw him off the scent? One thing's for sure, the twins will need some fancy footwork to get out of this...
It's Halloween, but twins Daniel and Justin aren't about to be spooked by ghosts and pumpkins - after all, one of them is a werewolf! But there's still plenty to be scared about - like knowing when to hold your new girlfriend's hand, and having to swap identities to keep your biggest family secret safe. Trick-or-treating has never been so confusing!