The Vandergilt Diamond Mystery

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Betty Astell

Mary

Bruce Seton

Hardcastle

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Hilary Pritchard

Briggs

Charles Paton

Mr. Throstle

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Ethel Royale

Mrs. Throstle

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Graham Soutten

The Boss

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Billy Holland

Carponi

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Henry B. Longhurst

Inspector Greig

Bryan Herbert

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John Miller