When retired war veteran Geoffrey Compton is found dead in his home, all the evidence points to suicide. However, his son Benjamin suspects there was more to the death and hires maverick ex-cop Sam Carlisle to investigate. Sam discovers a number of Geoffrey's old acquaintances have also passed away recently in suspicious circumstances, leading him to believe somebody is exacting revenge on these people, snuffing out their lives in the most calculating manner. To prevent more fatalities, Sam must trawl the past and find the cause of this twisted retribution, putting himself on collision course with the elusive figure responsible.