 How did Grannie Annie save the workers?
DOUBLE TROUBLE by CARL JACOBI Grannie Annie, that waspish science-fiction writer, was in a jam again. What with red-spot fever, talking cockatoos and flagpole trees, I was running in circles—especially since Grannie became twins every now and then. Grannie Annie strode in the lead, her absurd long-skirted black dress looking as out of place in this desert as the trees. But Miss Flowers, known to her friends as Grannie Annie, had always been mildly crazy. Blood-and-thunder as these books are, however, they have one redeeming feature—authenticity of background. Grannie Annie was the original research digger-upper, and when she laid the setting of a yarn on a star of the sixth magnitude, only a transportation-velocity of less than light could prevent her from visiting her "stage" in person. He was an old prospector Grannie had met, and he had become so attached to the authoress he now followed her wherever she went. Then it was found that this ore, Acoustix, revitalized their sounding apparatus, and the rush was on." So now here we were at the outer reaches of the Baldric, four travelers on foot with only the barest necessities in the way of equipment and supplies. And then all at once Grannie stopped again, this time at the top of a high ridge. As that dot continued to move across the heavens in a single direction, I called Grannie's attention to it.
 She discovered that ultraviolet could reverse the effects on them and used it to cure them.
 She found the location they all went to and helped them navigate back.  She removed the lens from the barracks that was making them sick.  She pretended to contract the fever and fooled Antler Park.  She discovered that ultraviolet could reverse the effects on them and used it to cure them.