This book is about little people who live under the floorboards. They call themselves "borrowers" because they take things from the house above to use in their house. The family of borrowers this book is about is the last one in the whole house. One day, when Arriety ventures out into the big house alone, she gets caught. The rest of the book is about the adventures she and her families have. I had to read this book for school, and I was surprised by how good it was.