This is based on the book by Herbert George Wells called, "The Invisible Man". In this book, the invisible man knows that he is invisible and uses it to his advantage. The reader who is able to read all that happens in the book, also knows that the man is invisible.
The other characters being Mrs. Hall and Mr. Henfrey do not know that the man is invisible which is why the invisible man is able to use his invisibility to his advantage by being amongst them inconspicuously.
