H. Beam Piper's death ended the life of one of the finest writers of the mid-20th Century. While he was known primarily as a "scifi" author, he wasn't limited to that field except by the market for his writing. "Murder in the Gunroom" is an example; the main character is a Private Investigator who uses his knowledge of firearms [an area that Piper was an expert in] to discover the motive for the crime that was listed as "accidental" or "suicide". While the peripheral characters, even the murder, were pretty much 2-dimensional, the story was still very readable, and it's unfortunate that Piper didn't write more stories using this character. I would recommend it to anyone who enjoys mysteries.
An interesting story, and one in which the main character, being thrown back in time to when he was a small boy [but with the memories of his whole life], acted upon these memories to change his life; having been killed in a future war, he attempted to change the future to prevent the war.