Bøger i The Crater School serien

Christmas is coming to the Crater School, so the girls must celebrate. So says the Earth calendar. But Mars does not respect school rules. Nor does the Red Planet have much respect for Earth weather. Why bother with a white Christmas when Martian weather can be far more dangerous?Then again, perhaps this is for the best. The people most likely to arrive at the Crater School with snow on their boots are Russian spies.