9780385326872 | Delacorte Pr, February 1, 2000, cover price $14.95 |
About this edition: While staying with their hippie grandparents, ten-year-old twins, Tod and Tessa, discover an unusual shop at the nearby mall, where they find a lie-detecting electronic pet, a Do-Right machine, and other alien gadgets which help them foil their nemeses, the evil Gneiss twins.
9780440416395 | Reprint edition (Yearling Books, May 1, 2001), cover price $5.50 |
About this edition: While staying with their hippie grandparents, ten-year-old twins, Tod and Tessa, discover an unusual shop at the nearby mall, where they find a lie-detecting electronic pet, a Do-Right machine, and other alien gadgets which help them foil their nemeses, t
9780606210515 | Demco Media, February 1, 2002, cover price $13.45 |
About this edition: While staying with their hippie grandparents, ten-year-old twins, Tod and Tessa, discover an unusual shop at the nearby mall, where they find a lie-detecting electronic pet, a Do-Right machine, and other alien gadgets which help them foil their nemeses, the evil Gneiss twins.
9780613427005 | Turtleback Books, August 1, 2000, cover price $15.40 |
About this edition: While staying with their hippie grandparents, ten-year-old twins, Tod and Tessa, discover an unusual shop at the nearby mall, where they find a lie-detecting electronic pet, a Do-Right machine, and other alien gadgets which help them foil their nemeses, the evil Gneiss twins.