Karigurashi no Arrietty (lit. The Borrower Arrietty), titled The Secret World of Arrietty in North America, is a 2010 Japanese animated fantasy film directed by Yonebayashi Hiromasa and scripted by Miyazaki Hayao and Niwa Keiko. It is based on The Borrowers by Mary Norton, an English author of children's books, about a family of tiny people who live secretly in the walls and floors of a typical household, borrowing items from humans to survive.
