The scientist Alice works in a company that specialises in the breeding of new plant species by means of genetic manipulation. One day she has a breakthrough: the cultivation of a purple-red flower that with ideal temperature and nutrition as well as regular encouragement makes its owner happy. Contrary to regulations, Alice takes one of the flowers home with her in order to make her son Joe happy. Mother and son give the plant the name Little Joe. But soon Alice has the unpleasant feeling that Little Joe is not as harmless as it appears.