"On a school field trip to the local wetlands, Sandy wanders away from her classmates and discovers an empty turtle shell. Peeking into the shell, she suddenly finds herself within a magical new dimension. Filled with sculptures, paintings and books, the turtle's shell is a museum of the natural world. But one painting is incomplete, and the shell's mystery inhabitant needs Sandy's help to finish it ..."--Back cover.

"An anthology of six original Last Kids short stories, designed to bridge the gap between books 6 and 7, features contributions by prominent graphic artists and finds Jack and his friends spinning yarns about their over-the-top post-apocalyptic adventures."--Provided by publisher.