half
past nine
But you must not come here again . Return to your hotel and -- Let me think . '' Senor Alvarado frowned in deepest thought ; then he said : `` I have it ! Every morning at half past nine a man wearing a Panama hat and a gray silk necktie with a large gold pin will pass along the sidewalk across the street from the Isla de Cuba . You will know him . One day , I can not promise how soon , he will lift his hat thus , and wipe his face . You understand ?