The appeal of the mystery story

Having finished two serious treatments of the Cold War and one of the 1929 stock market crash, I find myself searching for entertainment, but wondering why a mystery involving murder and crime is relaxing. (It's Blood Work by Michael Connelly.) Upon reflection, I think it's because the classic mystery story has the elements of storytelling that have appealed to people since they told stories around the fire in caves: believable good vs. believable evil and a resolution at the end. Real life and much of modern literature don't provide these gratifying elements.