ten o’clock
`` Well , and this morning ? '' `` I got up at the usual time this morning , set the breakfast table , and then knocked at the Professor 's bedroom door to waken him . He did n't answer , and I thought he might want to sleep , seeing as it was Sunday , and he was up late last night . So I waited until ten o'clock . Then I knocked again and tried the door , but it was locked . That made me uneasy , because he never locked his bedroom door before . I banged at the door and called out , but there was n't a sound .