The mystery on Walrus Mountian

Noah French was an expert skier until he broke his leg, and now he won't get back on skis. His parents take him to stay at the Kickingbird Lake Resort, where Robbie and Rebeka, ghost twins, watch him play a computer skiing game. After their ghost St. Bernard gets into the computer, the twins must help the dog get out and help Noah get back to skiing on a real mountain.