Hello,

My guess would be "Charlie Chan in Panama" (1940). Of course it's only a guess. Many wiser souls on this forum probably know for sure.

Teil

I've never heard of any Charlie Chan film being set on Catalina. But there was a film in another mystery series that was set there. It's a Hildegarde Withers mystery. It's called Murder on a Honeymoon and was made in 1935. Perhaps that's the movie you were thinking of. It's pretty good.

http://www.imdb.com/title/tt0026744/