“Murder Afloat” by L. Ron Hubbard
Publication date: October 1935
Original publication: Star Detective Magazine
Genre: Mystery & Suspense
Story description: A US Narcotics operative aboard the SS Cubana is hot on the trail of a million and a half dollars worth of heroin and opium. But all is not as it seems aboard the ill-fated ship …
Currently available as part of the Stories from the Golden Age series, in the title The Slickers.