"Every aspect of Penna's life is controlled for her: a computer programme tells her when to get up, eat, sleep. But one day the programme goes wrong. Suddenly Penna and her new friend, Veeka, don't know what to do. Can they trust the mysterious Queltus who alone seems to know what is happening? It seems a virus has been put into the programme. A virus which could destroy the earth ..."--Page 4 of cover.