Floyd Trevelyan's historic steam locomotive, newly restored, is the newest attraction in Moose County. But the excitement is eclipsed by shock when Trevelyan disappears--along with millions of investors' dollars. Puzzled and suspicious, Qwill's trying to make a connection between the missing millionaire and a recent murder at a nearby railroad tavern. Now, with the help of his cats, Koko and Yum Yum, he's about to prove that the police are on the wrong track.