Sirr ul Asrar is book by Syedna Ghaus-ul-Azam Shaikh Abdul Qadir Jilani, who is the Imam of Qadri order. In this book he has explained many basic concepts of Islam with two aspects sharia and Sufism. Alongwith he explained many other teachings for a seeker of the Divine path. For more details visit: www.sultan-ul-faqr-publications.com