Who Killed Robert Prentice? London: Hutchinson & Co., no date (ca. 1936). First edition. 4to. Murder mystery game in the format of a police dossier, comprising numerous facsimile typed letters, newspaper clippings, autograph letters, sealed pieces of "evidence", photographs, etc; typed game solution revealing the culprit at rear opened. Original stiff red printed wrappers, worn; old ownership signature on front paste-down. Together with: Herewith the Clues! London: Hutchinson & Co., no date (ca. 1939). First edition. 4to. Murder mystery game in the format of a police dossier, containing typed facsimile police reports, sealed "evidence" comprising cigarette butts, various ephemera, hair, pins, etc., as well as 11 photographic plates of suspects; solution revealing the culprit at rear partially sealed. Original stiff blue printed wrappers, lightly worn.