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Comparatively little known, this Monogram thriller is a remarkably concise adaptation of Wilkie Collins' lengthy 1868 mystery novel The Moonstone. On a dark and stormy night, Franklin Blake (David Manners) and his Hindu manservant Yandoo (John Davidson) arrive at Vandier Manor to deliver the Moonstone, a priceless gem stolen from an Indian temple way back in 1799. The recipient is Anne Verinder (Phyllis Barry), who despite being warned to lock the Moonstone away in the family vault, chooses to place it under her pillow. Sure enough, the gem is stolen during the night, right from under the sleeping Anne. Scotland Yard inspector Cliff (Charles Irwin) has quite an array of suspects to choose from, the most obvious of whom is usurious Septimus Lucker (Gustav von Seyfertitz). One murder and one assault later, Inspector Cliff reveals the genuine culprit -- who, in time-honored tradition, is the least likely and most cooperative of the suspects. The Moonstone is a prime example of what can be accomplished on a small budget with a little extra time and care.