Adopted from a book series of the same title, we follow the Grace family, twin brothers Simon and Jared (Freddie Highmore), sister Mallory (Sarah Bolger) and their mom Helen (Mary-Louise Parker), who have left New York to live in the secluded old house of their great uncle Arthur Spiderwick (David Strathairn). Strange things begin to happen on a daily basis, and the family blames Jared, but when he, Simon and Mallory start investigating what is really going on, they uncover the fantastic truth of the Spiderwick estate and of the creatures that inhabit it.