About eleven o'clock
Cartwright drew his gloves carefully from his hands , laid his silk hat on a chair , dropped into it a package of legal papers tied with a red string , and , adjusting his glasses , fixed his eyes on the mail-carrier . The expression on his face was bland and seductive . `` At what hour do you say the attempted robbery took place , Mr. Bowditch ? '' `` About eleven o'clock . '' `` Did you have a watch ? '' `` No . '' `` How do you know , then ? ''