Murder in the Coal Hole

When Mr. Polesworth, the unpleasantly efficient school manager, was found dead in a gas-filled coalhole, Inspector Arnold was convinced that the explanation was a practical joke gone wrong. But the nimble mind of Desmond Merrion soon proves that this simple theory is not the correct one, and from the slenderest clues he relentlessly builds up a case that sends a very clever murderer to the gallows.