about eleven o'clock
`` Your name is Malcolm Knox ? '' asked the constable , glancing at a note-book which he held in his hand . `` It is , '' I replied . `` You are required to come at once to Bow Street to identify a woman who was found murdered in a taxi-cab in the Strand about eleven o'clock to-night . '' I suppressed an exclamation of horror ; I felt myself turning pale . `` But what has it to do ------ '' `` The driver stated she came from your chambers , for you saw her off , and her last words to you were ` Good night , Mr. Knox , I am sincerely sorry to have given you all this trouble . ' Is that correct , sir ? ''