 Buck and Hawk discover an old man dying on a uncharted planet while searching for evidence of human settlements. He says it was destiny that brought him to this time and destiny that brought him to that planet. He entrusts Buck with a green jade box and tells him to take it to the next guardian. It s a legendary box and strange things start to happened to those who touch the box. Horrific future visions, but Asimov wants to get to his R and R, so he throws the box on the back burner. But they soon realize is if they don t take the box right away, that the time shifts may destroy them all.