The title is a reference to Sergio Martino's earlier giallo The Strange Vice of Mrs. Wardh (1971) ("The Strange Vice of Mrs. Wardh"), in which the same phrase appears in a mysterious note apparently sent by a killer.
Italian censorship visa # 60781 delivered on 1 August 1972.
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By what name was Your Vice Is a Locked Room and Only I Have the Key (1972) officially released in India in English?
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