The Reckoning, Airth - B

                                               This is the fourth book in a series about Inspector John Madden. The last one was five years previous; Madden is now retired and the author is eighty.  The story is somewhat haunting as it feels like something I've read recently, but can't place. The setting is post-WW2 Britain and the case involves a series of up -close-and-personal assassinations . Madden is called back because one of the victims wrote to Scotland Yard mentioning his name.  As the deaths pile up, Madden is the one who finds the thread - a WW1 court martial that was a travesty of justice.  The victims are those who condemned a shell-shocked soldier to death. They are tracked down and executed with a bullet to the back of the neck by a seasoned and skilled professional.  But, the soldier left no one in England to seek revenge and his only  daughter is believed to be in Canada. As it turns out, the daughter was  an agent for SOE during the recent war and has only just learned of her father's execution.  She indeed seeks revenge and achieves her goals before Madden stops her.