Beth lives with her cruel uncle who makes her do chores while he works as a mushroom scientist. He takes Beth and her cat George into the desert for two weeks to search for a rare mushroom. After a long, tiring walk under the hot sun where Beth hallucinates water, she finds an oasis with George and Mr. Turtle, a turtle she had rescued. In a hollow tree at the oasis, Beth discovers the rare mushroom her uncle was seeking.