Knife Edge — Douglas Reeman

After the murder of his father, Lieutenant-Colonel Mike Blackwood, Ross Blackwood finds himself assigned to the Far East, taking on rebels and illegal-arms dealers in Hong Kong and Malaysia. Along the way he meets another Blackwood, his cousin Steve, who has made a life for himself in the Corp, as an explosives expert. The two Blackwoods uphold the honor of their family and their chosen profession while negotiating the fallout of Britain's post-colonial politics.