The story idea of "Mystery of Heaven" comes from the 1965 Hollywood movie "Signpost to Murder", which was remade in 1969 by two brothers Yash Chopra (director) and BR Chopra (producer) into an Indian movie "Mystery of Heaven" , In 2017, BR Chopra's grandson Abhay Chopra made a remake of Grandpa's "Mystery Case".
The resources of these two films in 1965 and 1969 are hard to find, especially the Chinese subtitles are hard to find. It is also good to watch the 2017 film. That's one of the values of remakes: letting people discover films that were good before.
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