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...he left his office at seven and  reached home   half hour later,  Martha had  cooked the dinner  before  tucking her children  in bed, she had  helped them  change into their  night suits,  Harris kissed his both kids good night 

Martha  followed Harris  out of the  children's bedroom and watched him carefully  was he really that tired,  he was making a drink for himself and smiled at her trying hard not to look tired but she was a a shrewd and healthy woman,  golden blonde with blue eyes  she said  he need not  hide his   fatigue,  he truthfully  declared he was ready to collapse onto the floor,  she served  the dinner,  he ate in a lost manner,  she was kept updated  on the  case  telephonically and  thankfully didn't ask  questions as he ate his food after twenty hours , finally she asked him if he was  daydreaming,  Harris said he was thinking of Ann 

Martha bristled  who is Ann 

Ann he explained was his sister  dead  when she was five,  his family avoided speaking of her , though Martha knew his family for ages  Ann  was never mentioned  to anyone