On the fifth mission to the Moon disaster struck, and the launch of the FS-6 team was rushed ahead to mount a rescue mission. What they found when they reached Farside Base was a situation beyond their comprehension. Two members of the FS-5 team were dead, and a third died of fright soon after they found her. And the mission commander and two other astronauts were missing. Suddenly the FS-6 team found themselves de facto detectives in a murder investigation. And hanging over them was the threat that whatever had claimed the sanity and lives of their colleagues might at any moment strike at them! 
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