It contains an interesting take on lycanthropy. Present-day kids (a brother and sister) time-travel to ancient Germany to help a werewolf that was cursed (instead of bitten) to transform into a wolf every night (not just full moons) by an evil sorcerer.

It isn't a fabulous book, but it's fairly good and has quite a different plot from most werewolf stories, so I'd recommend it to werewolf fans so that they get a chance to peruse something different.

3/5 stars