Margaret is really worried about her father. Ever since he lost his job, he spends all of his time locked in the basement. What is going on down there? He says he is just doing a little plant testing . . . harmless really. But when Dad does come up for air, he acts strange and is only getting stranger. All he ever says is “stay out of the basement!” So when her Mom goes out of town, Margaret’s worry turns to fear. Especially when she and her brother discover the root of the problem.