an interesting movie and a worthy part of the sherlock holmes tradition . the most interesting part for be the use of the count down note a the member of the organization die . it even include a red herring note . if the viewer be pay attention and it be a clue to the actual murderer . agatha christie and the well know english mystery writer who also have have many book make into movie and use a similar motif in her book and ten little indian . the most fascinating part and though and be that this movie be make in 1933 and ten little indian be publish in 1939. christie may have borrow from this movie for her plot .