A producer decides to reopen a theater, that had been closed five years previously when one of the actors was murdered during a performance, by staging a production of the same play with the remaining members of the original cast.
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The plot is like a Scooby-Doo mystery and the acting is cliche and over the top (even for a silent film), but the effects and camera work is interesting, using odd angles, swinging cameras and unusual double exposures and title effects. Though The Last Warning isn't scary, it's an interesting product of its time and worth one look if you can track it down.