In 2030, the city of Ottawa is covered by a dome to protect its citizens from widespread pollution. Only a few spots of real wilderness are left in the world. Sara and her brother, Karl, are reluctantly traveling with their grandmother to the North Pole to see the natural world and to fight a last environmental crusade. Not only will the kids have to do without movies, computers, and rollergyms, but when they arrive at the pole, Sara learns that her brother is planning a crazy experiment. If his scheme succeeds, it will involve the terrifying prospect of time travel to the past. Suddenly, everything that has always made Sara feel safe vanishes in this exciting story about the present and the future. "A well-written time travel adventure." -- Booklist "Katz combines fantasy, science fiction, and ecological issues in this appealing tale." -- Publishers Weekly