Mrs. Frisby, a widowed mouse with four small children, must move her family to their summer quarters immediately, or face almost certain death. Her youngest son, Timothy, lies ill with pneumonia and must not be moved. Fortunately, she encounters the rats of N.I.M.H., an extraordinary group of highly intelligent creatures. These rats come up with a brilliant solution to her dilemma. Why do they help her? How did they become so intelligent? Find out in this captivating novel by Robert C. O'Brien. This Newberry Award winning book has been made into a feature film as well.