When Davey Martin's family moves to Mars, he discovers that there's nothing to do--at least until he and his robot dog Polaris learn to seize the spirit of adventure. It's not until they've zipped around the planet on his flying scooter--climbing Martian "trees," digging up "fossils," dancing in Martian rain dances--that they discover a treasure that finally piques Davey's interest--a source of water on the red planet Chris Gall's new picture book...