Six
o'clock
The Chief swung round on his heel and fairly searched Mr. Marigold with a glance from beneath his bushy eyebrows . The detective returned his gaze with an expression of supreme innocence . `` Why , Marigold , '' answered the Chief , `` I believe I should . Six o'clock suit you ? '' `` Certainly , sir , '' said Mr. Marigold . Desmond stood by the door , vastly amused by this duel of wits . The Chief and Mr. Marigold made a move towards the door , Desmond turned to open it and came face to face with a large framed photograph of the Chief hanging on the wall of Miss Mackwayte 's bedroom .