京剧武生关玉楼（狄龙）的猝死引来其弟关小楼（姜大卫）对两人过往点滴的深情回忆，伤情之余，小楼在蛛丝马迹中发现其兄之死可能另有隐情，展开调查，发现真相是与嫂子花正芬（区燕青）有染的国术馆长封开山（谷峰）

Answering Fire - In a suspected terrorist attack on a London hotel a government minister is killed.