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320 pages, Hardcover
Published January 1, 1932
All supernatural ... agencies are ruled out as a matter of course. We have a ghost inhabiting Wallace's house.
Not more than one secret room or passage is allowable. Lost count. Secret passages are explained by renovations which walled-in staircases. Secret doors swing in and out.
No hitherto undiscovered poisons may be used, nor any appliance which will need a long scientific explanation at the end. The appliance appears on schedule: a vacuum pump with a long needle in the center; but relax - it is not the murder weapon. Scientific explanation is provided at the end.
Twin brothers, and doubles generally, must not appear unless we have been duly prepared for them. Doubles abound! Mary's double is duly prepared for, but wait, there's more!