Now that her moonshine shop is up and running, Hattie Hayes can focus her efforts on expanding her fledgling business to events in the area, like the Chattanooga Choo Choo Model Train Convention, which is running full steam ahead at the convention center down the block. Hattie is all aboard, seizing this perfect opportunity to promote her Southern homebrew to the folks who have come to the city for the annual event.

But when an attendee dies after drinking some of Hattie's moonshine, she'll need to prove her innocence. Between tight-lipped train hobbyists and competitors for a coveted convention prize, Hattie has a wide array of suspects to choose from, and she'll need to use all the tricks up her sleeve to make sure her moonshine business can survive a murderer and stay on track.