Generate a question about the following movie plot: This article's plot summary may be too long or excessively detailed. Please help improve it by removing unnecessary details and making it more concise. (August 2015) (Learn how and when to remove this template message) Recently divorced Helen Grace (Mary-Louise Parker) moves into the Spiderwick Estate in the woods with her children when it is given to her by her elderly aunt Lucinda (Joan Plowright), though identical twins Jared and Simon (Freddie Highmore) and their older sister Mallory (Sarah Bolger) do not want to move from New York. When Jared uncovers a dumbwaiter system behind a wall, he finds a monogrammed key and discovers the study of the late owner of the estate, Arthur Spiderwick (David Strathairn). Jared then uses the key to open a chest. In it, he finds Spiderwick's field guide to fairies; although an attached note warns him not to read it, he does so anyway. When Jared explained about his discovery on the existence of magical creatures, Helen and Mallory don't believe him. Soon after, Jared meets a brownie named Thimbletack (Martin Short), who explains that magical creatures are normally invisible, but can reveal themselves at will. He tells Jared about a protective circle that Arthur Spiderwick placed around the house and gives him a stone with a hole through which he can see fairies. However, a shapeshifting ogre named Mulgarath (Nick Nolte) wants the field guide for himself so he can rule over all fairy-kind. He sends his goblins, led by Redcap the Pompous Goblin General, to obtain it and they kidnap Simon, mistaking him for Jared. Meanwhile, Jared meets Hogsqueal (Seth Rogen), a hobgoblin and bitter enemy of Mulgarath because Mulgarath killed his entire family. Hogsqueal gives Jared the ability to see fairies without the aid of the stone by spitting in his eyes. Mulgarath lets Simon go and berates Redcap for failing his master. Jared finds Simon and both fight over the book, which is spotted by the goblins. Together, the twins flee to the house, though Simon is injured when one bites his...
Why would fire not harm the book?