Be First in the Universe

Be First in the Universe by Spinner, Stephanie. hardcover edition. ISBN: 9780385326872.

Gemini Jacks U Rent All Be First in the Universe! When they accidentally walk backwards, Tod and his twin sister Tessa notice a flashing neon sign in the mall. Theres something strange about it—instead of blinking on and off, the sign appears and disappears. One minute its there, then no neon, no sign, nothing. And thats only the first clue that this is no ordinary store. Gemini Jack rents all sorts of things that the twins have never even imagined. Maybe Tod and Tessa can rent something to help them deal with the only other set of twins in their grade, Nancy and Ned. Theyre so mean that double trouble only describes one of them. And they get away with everything. But why is Jack so interested in meeting the evil twins?