When an affluent railcar owner disappears with millions of dollars belonging to Moose County investors, the international police launch an intense investigation to find the fugitive. But journalist detective Jim Qwilleran and his feline crime-busters find a mystery to unravel that is closer to home. Who blew the whistle on the embezzler? And, why did they do it? Qwill goes full ahead to solve the puzzle before tragedy occurs, but the case is complicated by a train wreck on the main line and a murder in a railroad tavern. Only Qwill and the cats can find the answer to the questions "who?" and "why?".