The Johnny Worricker Spy trilogy concludes with Salting the Battlefield, in which our hero with his The Johnny Worricker Spy trilogy concludes with Salting the Battlefield, in which our hero with his ex girlfriend, Margot are criss-crossing Europe trying to stay one step ahead of the security services and a vengeful Prime Minister. Worricker is being watched - His family and friends are being watched - He is running out of cash and he needs to make a move to reach an endgame.