Actor Mona 13 recites poetry and Shakespeare at the drop of a hat. Engineer Rush 12, mischievous, builds Meccano bridges. Miranda "Randy" 10 dances and paints pictures. Oliver, 6, calm and thoughtful, is a train engineer. Father writes. Housekeeper Cuffy mothers.

    and Mrs. Watson, Mercy is not just a pig — she's a porcine wonder. And to the portly and good-natured Mercy, the Watsons are an excellent source of buttered toast, not to mention that buttery-toasty feeling she gets when she snuggles into bed with them. This is not, however, so good for the Watsons' bed. BOOM! CRACK! As the bed and its occupants slowly sink through the floor, Mercy escapes in a flash — "to alert the fire department," her owners assure themselves. But could Mercy possibly have another emergency in mind — like a sudden craving for their neighbors' sugar cookies?

    Together, they are able to bring art to life and enter paintings at will. Their extraordinary abilities are highly sought after, particularly by a secret group who want to access the terrors called Hollow Earth. All the demons, devils, and evil creatures ever imagined are trapped for eternity in the world of Hollow Earth—trapped unless special powers release them.The twins flee from London to a remote island off the west coast of Scotland in hopes of escaping their pursuers and gaining the protection of their grandfather, who has powers of his own. But the villains will stop at nothing to find Hollow Earth and harness the powers within. With so much at stake, nowhere is safe—and survival might be a fantasy.