Mark Waters (Disney's "Freaky Friday" remake) directs; Karey Kirkpatrick, David Berenbaum, and yes, *that* John Sayles pen the untaxing screenplay; David Strathairn appears as Arthur Spiderwick mostly in equally untaxing sepia-toned flashbacks (no huffing and puffing up mountainsides for him this time out); and everyone's favorite stuffy grandmotherly British type Joan Plowright ("Widows' Peak," etc.) plays Great Aunt Lucinda, safely squirreled away at the local sanatorium on account of her obsessive culinary indulgences: salt, honey, and spaghetti sauce.