One Behind the Ear by Wensley Clarkson
Malcolm Deakin, one-time Falklands hero, is a hitman; a classic gangland shooter with twelve ice-cold killings to his name on the streets of London. Each one of these twelve killings is committed without remorse; Deakin does not give a second thought to his hapless victims. But then along comes target number thirteen - It is an old school friend, and as the hitman begins researching the contract he gets the nasty feeling that his intended victim is about to turn the tables on him. One Behind the Ear takes the reader on a nail-biting, roller-coaster ride through the full, face-on-brutality of southeast London's underworld.