Moon Robber — Dean Morrissey

One day, an earthquake rattles the town of Old Bridgeport. In The Magic Door Toy Shop, an old rusted door swings open. Surprised to see an unfamiliar room on the other side, Sarah, Michael, and Joey step through. As the door in the toy shop slams shut, the three children find themselves in Great Kettles, a mysterious land in another dimension.

Great Kettles is a magical place, filled with storybook characters such as the cow that jumped over the moon, the Sandman, and even Father Time himself. Yet all is not peaceful in this amazing world. Mogg the giant is stomping around, looking for something -- something important. But the trouble really begins when Mogg finds what he's looking for and does something that could destroy both Great Kettles and Old Bridgeport. It is up to the children, with the help of some new and some old friends, to stop the giant and find a way back home.

The Moon Robber is the first book in The Magic Door Series.