The Mystery of the Blue Train - Agatha Christie

A detective thriller that takes place on the blue train; In it, senior detective Poirot tries to find the killer of Lady Ruth. "Ruth" was not only killed, but her facial features were mutilated; until people almost didn't know it; Moreover, her precious jewels were also stolen. Who do you think committed that crime: killing, maiming, and stealing? And who meets these three goals, who knows "Ruth"?
Is it her husband whom she separated from days before her death? or her maid? Or a close acquaintance of friends? Or are they the train robbers who appeared these days?
So, will Poirot find the real culprit?