Whipped Up — Stuart G. Yates

Paul Chaise, ex-SBS, is trying to leave his old life behind but his old ‘employers' have other ideas. Returning home from Spain, he just wants to find his girlfriend, live a quiet life - and forget. A job selling property in Suffolk seems to offer the perfect escape route until he becomes involved with a client's problems and everything spirals out of control. Some particularly nasty Eastern European gangsters want to take over the running of the client's houses and use them as bases for human trafficking.

The client ends up dead and his wife tortured, her mutilated body left in Chaise's flat as a warning. Chaise goes on a one-man crusade and the body count mounts up. The S.I.S. gets wind of this, decides to rein Chaise in and that's when things get really nasty.