"The Borrowers Series" is a collection of children's books written by Mary Norton. The series follows the adventures of tiny people called Borrowers who live secretly in the homes of humans. They "borrow" everyday items to survive, such as sugar cubes and buttons, while avoiding detection. The main characters include Arrietty, a young Borrower, and her family, who navigate the challenges of living in a world much larger than themselves. The series explores themes of resourcefulness, friendship, and the importance of understanding different perspectives, making it a beloved classic in children's literature.