"The Spiderwick Chronicles is a game based on the movie of the same name. The movie is based on a set of books of the same name. I haven't read the books, so I'm not sure how close any of this is to the source material, but the game is extremely close to the movie (at least so far).
Mallory, Jared and Simon Grace arrive (along with their mom) to live in the dusty estate of their Aunt Lucinda (who is not in residence). Mallory is the older sister with a fencing medal (so you know she's good with a sword). Simon is the cerebral twin - your go-to guy for inventions. Jared is the more aggressive twin, more than happy to get physical with his baseball bat and definitely most likely to leap headfirst into danger."