A type of irresistible force compels the two mortal enemies, Martin Mystère and Sergej Orloff , to meet in the forgotten monastery of Taglakhar, The castle on the precipice, situated in a remote area of the Himalayas . Here, the wise Kut Humi calls to mind that the two rivals had a past of calm friendship, experienced by Mystère and Orloff in the mystical peace and quiet of the Roof of the World