qnli question: Who wrote Hasan Mellâh yâhud Sırr İçinde Esrâr? sentence: In a similar vein, the novelist Ahmed Midhat Efendi wrote important novels in each of the major movements: Romanticism (Hasan Mellâh yâhud Sırr İçinde Esrâr, 1873; "Hasan the Sailor, or The Mystery Within the Mystery"), Realism (Henüz On Yedi Yaşında, 1881; "Just Seventeen Years Old"), and Naturalism (Müşâhedât, 1891; "Observations").