The Notorious Lone Wolf (1946)

Starring Gerald Mohr, Janis Carter, Eric Blore, John Abbott, William Davidson
Directed by D. Ross Lederman
(actor & director credits courtesy IMDB.com)

Former jewel thief Michael Lanyard, aka The Lone Wolf, falls under suspicion again when a valuable jewel is stolen from Indian royalty, but has a scheme to find the real culprit.

Per Wikipedia, this was the first Lone Wolf film from Columbia Pictures after a three year absence, and the first to star Mohr, replacing Warren William after a long run on the series, although Blore returns as Lanyard's faithful butler.  Although the setup for the mystery is fairly clever, its execution relies on several coincidences and and not all the plot ends are convincingly wrapped up, but it still makes for an amusing romp.  Blore, a cinema treasure in his own right, plays very well off of Mohr, and Mohr's smooth delivery makes him a nice fit in William's former shoes.  

The Intruder (1933)

Starring Monte Blue, Lila Lee, William B. Davidson, Gwen Lee, Arthur Housman
Directed by Albert Ray
(actor & director credits courtesy IMDB.com)

After a murder takes place on an ocean liner, the ship is wrecked during a storm, and the murder suspects and a police detective are stranded together on a jungle island.

Although otherwise a routine mystery, the film's island setting makes this an intriguing one, with wild gorillas and a crazy castaway also inhabiting the island.  Humor is mined from that castaway, (leading up to a pretty funny sight gag), and a perpetually inebriated character, who's not quite as amusing.  All in all, it's an entertaining time-passer which makes good use of its locale to stand out from other entries in the genre.