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 Sink your teeth into Justin and Daniel's third wild adventure

Author Biography

Sienna Mercer lives in Toronto, Canada, with her two cats, Calypso and Angel. She does most of her writing in her attic, surrounded by photos of her travels. Sienna Mercer is the author of the bestselling My Sister the Vampire series. She doesn't have a twin sister, but always wished that she did.