Nothing to Lose — Robert Charles

Simon Larren had an inbred lust to kill, sharpened by his war-time years with S.O.E. When the war ended, Andrea came into his life. She loved him, tamed him, married him and finally brought him back to civilization. Then came a chance meeting in Paris that ended in her death. It was the spy-ring's biggest mistake. Andrea's death revived the killer instinct in Larren and started him on a relentless and bloody trail of vengeance.