Casper and Jasper and the Terrible Tyrant

Casper and Jasper are fast-talking, twelve-year-old twins who discover that their parents, long believed dead, are in fact rebels being held by the evil Count Wilhelm Scream. When the boys set out to rescue their parents, they stumble into a land of werewolves, trolls, and carnivorous marshmallows. Will the twins' loyalty and quick wits be enough to save their parents - and themselves?