The Spiderwick Chronicles is based on Holly Black and Tony Diterlizzi's bestselling children's book series of the same name. It's the story of three children who battle goblins and other magical creatures who are after Arthur Spiderwick's Field Guide.
Here the trailer:
Their world is closer than you think.
"Upon moving into the run-down Spiderwick Estate with their mother, twin brothers Jared and Simon Grace, along with their sister Mallory, find themselves pulled into an alternate world full of faeries and other creatures." (Source: IMDb)
In the wake of Lord of the rings and of Narnia, Spiderwick Chronicles surf the wave of a renewed interest for fantasy and faery tales.
So not a pioneer movie but probably a good entertainment.