six o'clock
As a matter of fact , I had never spoken to him before in my life . Since then he has persistently annoyed me . I have suspected him of possessing a skeleton key to my apartments . To-night I locked up my flat at six o'clock . It was then , I am sure , empty . I dined with a friend and went to the ` Unusual . ' At a quarter past eleven I returned here with this gentleman , Mr. Brendon .