 By 1964 , Lessing had published six novels , but grew disillusioned with Communism and , after reading The <unk> by <unk> Shah , turned her attention to <unk> , an Islamic belief system . This prompted her to write her five @-@ volume " space fiction " series , Canopus in <unk> : Archives , which drew on Sufi concepts . The series was not well received by some of her readers , who felt she had abandoned her " rational <unk> " . 
