His Lordship (1936)

This is quite a fun comedy drama with George Arliss in dual roles. When a Middle eastern ruler is assassinated, "Richard" returns to London to warn the heir that he is to be next. Luckily, his twin brother is a bigwig at the UK Foreign Office, but after he refuses to get involved for fear of causing a diplomatic incident, it falls to "Richard" to try and impersonate his loftier brother and save the day. The plot does run a bit to stereotype and Arliss isn't really challenged here, but the dialogue and pacing are efficient and there is just the merest hint of menace as he closes in on the real culprits. The conclusion is never in doubt, but as a vehicle for the star this works fine for 70 minutes.