Mr. Moto In Danger Island
Herbert I. Leeds
Peter Milne (screenplay), John Reinhardt (story), George Bricker (story), John W. Vandercook (novel), John P. Marquand (character)
Peter Lorre as Mr. Moto, Jean Hersholt as Sutter, Amanda Duff as Joan Castle, Warren Hymer as Twister McGurk, Richard Lane as Commissioner Gordon
"The U.S. government asks Mr. Moto to go to Puerto Rico to investigate diamond smuggling after an earlier investigator is murdered." - IMDB
Note: though in the Mr. Moto movie series, this was based on the book .