Mosey Frye, real estate agent and amateur sleuth, comes upon a corpse in the garage at Sunny Banks, the home of local towboat magnate Martin Eldridge. Hembree police chief Lieutenant Gus Olivera tracks a lead on a man who tried to extort money from the Captain Jack crew, claiming they were intoxicated on the night of a fatal collision. But Mosey, ever inquisitive, sets her sights on the Eldridges' distant past and ultimately reveals a more devious plot to destroy the elderly riverman's legacy and take control of his company.