In the near future of this story , the moon has become a new frontier where pioneers excited by the prospect of developing an untapped world mostly mine at small and isolated stations. The moon is a dangerous place, and these pioneers unfailingly help whoever is in trouble; giving and getting help when needed is how they survive. When Mark Jordan is told that a diplomat's vehicle has been damaged several miles from his station, he unquestioningly sets out to rescue the man. A previously uncharted shower of meteors has ripped through the vehicles's engines; this same shower threatens Mark and the diplomat as they race across the shadowy landscape of the moon in a desperate race for their lives. They will die horribly of radiation poisoning if the sunlight of a lunar dawn catches them!