The Grandfather's War is a science fiction novelette written by Murray Leinster, an American author known for his significant contributions to the science fiction genre during the 20th century. Unfortunately, there isn't a detailed synopsis readily available for this specific novelette. Murray Leinster's works often explored themes of technology, space exploration, and the human condition, so we can provide a general overview of what a story in this vein might entail. "The Grandfather's War," likely delves into a futuristic or speculative scenario where technology and its implications for humanity play a significant role. It might feature a protagonist or a group of characters dealing with the consequences of advanced technology, exploring its potential benefits and dangers. The narrative could revolve around a conflict or dilemma arising from the use of advanced technology, focusing on how individuals or society grapple with its impact. Themes such as ethics, progress, societal change, or the human response to rapid technological advancement might be central to the story.