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Six months have passed since the mysterious murder of Thomas P. Manning (Sam Flint), an affluent man whose body was discovered in a locked room. The police have gotten no closer to solving the case or to uncovering the meaning of the particular chess pieces found in the victim's hand. Now, prompted by the release of a scandalous book about her father's demise, Leah Manning (Joan Woodbury) has hired eccentric detective Charlie Chan (Sidney Toler) to uncover the curious truth. Wikipedia