midnight
Then he and his sister heard their father moving around his room . `` What is it , Walter ? '' asked Mrs. Brown . `` It 's a midnight alarm , '' he answered . `` I guess it must be a fire , though it 's the church bell that 's ringing . I ca n't see any blaze from my window , but it must be a fire , or why would they ring the bell ? '' `` And why should they ring the church bell , when we have a fire bell ? ''