Who is Johan from The Upstairs Room and what is their importance? The_Upstairs_Room English & Literature Johan | The Upstairs Room

Annie and Sini are sent to live with a man by the name of Johan Oosterveld. Oosterveld constructs a hiding place for the girls behind a closet in his home. Initially, the girls are only supposed to spend a week or two with Johan, but in the end, they've been with him for more than two years.