Many waters Time quartet, book 4

Summary: A touch of computer keys, a blast of heat, and suddenly the Murry twins, Sandy and Dennys, are gasping in a shimmering desert land. If only the brothers had normal parents, not a scientist mother and a father who experiments with space and time travel. If only the Murry twins had noticed the note on the door of their mother's lab: Experiment In Progress. Please Keep Out But it's too late for regrets. There's a strange-and very small-person approaching, with a miniature mammoth in tow. . . . At last it's Sandy and Dennys's turn for an adventure-an adventure that turns serious when they discover that "many waters" are coming to flood the desert. The twins must find a way back home soon, or they will drown. But how will they get back to their own time? Can they?

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