The Gun In The Golf Bag

It is 1973. Brian, an IRA sniper is making good his escape after having completed his last hit. He's had enough of the violence associated with the Northern Irish Troubles and throws his rifle, which he has always carried in a golf bag, into the sea. The story, based in Suffolk, follows the reformed sniper in search of peace and quiet and DCI Cartwright in search of Brian. The complex plot unfolds when a local fisherman trawls up the golf bag. For all that Brian finds what he's looking he becomes involved in kidnap and murder. Then when it seems that all will end happily ever after, justice is served - or is it?
Although this is a story in its own right it is also the final novel in the trilogy which begins after WWII in Easier Than It Seems and develops through the exploits of a black marketeering Scotsman who becomes a gun runner for the IRA in Retribution. It has nothing to do with golf!