On a quiet country station, Detective Arthur Crook, waiting for the train to London, witnessed a near-fatal accident. Despite the arm of her companion, Miss Imogen Garland slipped and almost fell under the train. No harm was done, and Arthur Crook might not have thought anything more about it had not a newspaper item a few weeks later caught his eye. Miss Garland had once again been involved in an accident, this time fatal. Only it was not Miss Garland who had died . . .