Thanks Tobin (and again thanks for posting my pic!).
I'm always interested in watching a movie based on the work of the extremely prolific Edgar Wallace, who died suddenly from undiagnosed diabetes during the initial drafting of "King Kong" (1933), which came out the year before "Mystery Liner" was released. In addition to creating Kong, he wrote 18 stage plays, 957 short stories, and over 170 novels, 12 in 1929 alone. More than 160 films have been made of his work, a good chunk of them in Germany in the 1960s, a subgroup of crime stories which came to be collectively known as Krimis (Germany's answer to the Italian Giallo).