six o'clock
He must see them , but he must telephone first and learn their whereabouts . He could , he concluded , call in a disguised voice , and get a line on things anyhow . So , still in a haze of doubt and uncertainty , he looked up the number and called Shelby . As he rather expected , Shelby was not at his home , but the person who answered could give no directions save to say that Mr. Shelby would probably be home by six o'clock , and would he leave a message ? `` No , '' returned Peter shortly , and hung up . Getting next the number of the Leonardo Studios , he asked for Gilbert Blair . `` W-what -- who ? ''