Central female lead who approaches Drummond under false pretenses regarding a car breakdown, later revealing ties to a missing Scotland Yard agent and becoming a high-value target for diamond thieves.
Drummond recognizes Doris's deception but chooses to cooperate, forming a tactical partnership against the intruders.
Doris Meredith is identified as Meredith's daughter, linking her personal stake to the broader case.
Doris provides crucial personal details about her brother's disappearance to the Inspector.
Implied romantic tension consistent with the era's adventure genre and character positioning.
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