"The Killer" by J. T. Oliver is a short story that falls within the genre of crime fiction, likely written in the early 1950s. The narrative revolves around a private investigator, Ernest H. Smith, who runs a business focused on murder for hire. The story explores themes of morality and the consequences of one's actions in a world where technology can facilitate perfect crimes. The plot begins with Mrs. Wilma Rogers approaching Smith to request the assassination of her stingy husband, offering a hefty sum in return. Smith meticulously plans the murder, employing a futuristic method that seemingly ensures he will not be caught. However, just as he thinks he has successfully executed the perfect crime, an inspector from the future appears, revealing that Smith's actions have been tracked, and he is under arrest for his deeds. The story culminates with a twist that highlights the inescapability of justice across time, leaving readers to ponder the implications of crime and accountability. (This is an automatically generated summary.)