The July 17, 1973 coup serves as a case study of the nature and extent of great-power interest and involvement in Afghanistan. The dynamics of American, Soviet, and Chinese interaction are multifaceted and volatile, and imply that no one great power had outright control. Thus, this treatment concerns influence rather than control, and multilateral interaction rather than unilateral or bilateral action. The differing interests of the great powers in Afghanistan are outlined. Next, the possibility of great-power involvement in the coup is examined. Finally, the impact of the coup upon Afghanistan's relations with the three great powers is considered. Available material suggests that neither the United States nor the People's Republic of China had sufficient interest or influence to instigate the coup. Nor is there any concrete evidence that the Soviet Union played a significant role, although it did have the opportunity, influence, and interests to do so.