Time is running out for Mrs. Frisby, a widowed mouse with four small children. She must move her family before the farmer destroys their home, but her youngest son, Timothy, lies ill with pneumonia and is too sick to be taken on such a perilous journey. In this beloved 1972 Newbery Medal winner for readers 8 to 12, help comes in the unexpected form of a highly extraordinary breed of super-intelligent rats who have been altered by scientific experiments. The rats of NIMH come up with a brilliant solution to Mrs. Frisby's problem, but the rats are in danger too, threatened by enemies from their extraordinary past.