In The Grey Falcon, Hamza Malik offers an account of the life and teaching of the twelfth century scholar and Sufi of Baghdad, and eponym of the Qadiri order, Shaykh ʿAbd al-Qādir al-Jīlānī (1077-1166). The question of whether Jīlānī was a Sufi, or simply a scholar appropriated by later Sufis as has been sometimes suggested, is tackled through an analysis of his three most popular works, the Ghunya li Ṭālibī Ṭarīq al-Ḥaqq, the Futūḥ al-Ghayb, and the Fatḥ al-Rabbānī. Malik identifies and presents Jīlānī’s Sufi thought and theological stance, and furthermore attempts to paint a picture of the character and personality of Jīlānī, as might be ascertained solely from the works analysed.