eight o'clock
`` I understand what your duty is , '' he continued . `` Since this imported French jackass has made this charge , of course you 'll have to look into it . Come down to the office and make some inquiries , and then go up to my flat . I was at home last evening after eight o'clock . `` What did you do before that ? '' `` I had dinner with my wife , and then put her aboard a train . She 's gone away on a visit . ''