four o'clock
She was standing with her back to the window from which she had looked down on to the château of Vasselot while Colonel Gilbert related his idle gossip respecting that house . And Mademoiselle Brun , who remembered such trifles , noted that she never looked out of that window again , but avoided it as one would avoid a cupboard where there is a skeleton . Denise , who consulted her watch again so soon as the colonel had left , wrote another letter , which she addressed in an open envelope to the postmaster at Marseilles , and enclosed a number of stamps . She went out on to the high-road , and waited there in the shade of the trees for the diligence , which would pass at four o'clock on its way to Bastia . The driver of the diligence , like many who are on the road and have but a passing glimpse of many men and many things , was a good-natured man , and willingly charged himself with Denise 's commission . For that which she had enclosed was not a letter , but a telegram to be despatched from Marseilles on the arrival of the mail steamer there . It was addressed to Lory de Vasselot at the Cercle Militaire in Paris , and contained the words -- `` Please return unopened the letter posted to-day . ''