Fungus is worried - he has been spotted by a human ("dry cleaner") on one of his trips up top. Meanwhile, he and Mildew are despairing of their teenage son Mould. He is starting to become a "drop-in" – washing regularly, even using deodorant! Something has to be done to rid Mould of his fascination with the Dry Cleaner way of life. Fungus decides that he will, for the first time, take Mould, “up top”. Maybe a dose of the reality will cure Mould of his unhealthy obsession? Up top, after a very successful night of scaring, during which father and son really begin to bond, Fungus and Mould are spotted at dawn by Jessica, a dry cleaner intent on proving to herself that she didn’t imagine what she had seen in her kitchen a few days ago! During the panic that ensues from them being spotted, Fungus and Mould get separated!