The Indian theatre and film community loved the film so much that they adapted it several times. It was adapted as a stage play "Dhummas", meaning fog, and was first made in Gujarati, then Marathi and finally in Hindi. Veteran theatre actress Sarita Joshi played the lead in all three versions. Then, it was made into the hit Hindi film Ittefaq (1969) with Nanda Karnataki and Rajesh Khanna, followed by a remake, also titled Ittefaq (2017).
Based on the play of the same title by Monte Doyle that opened at the Cambridge Theatre in London on February 9, 1962.
Brief as it was, this film was cut by a further ten minutes for general release in Britain.
The premise of "Signpost to Murder" is that, under the 19th-century "Lunacy Act," someone previously judged insane who escapes and remains free for 14 days is entitled to a new trial. In Monte Doyle's 1962 play "Signpost to Murder," the required period was 28 days, not 14. Whether or not either has any basis in 19th-century British law, the Lunacy Act of 1890 was repealed in 1959, before either the play or film appeared.
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