Mrs. Frisby and the Rats of NIMH is a classic children's fantasy novel by Robert C. O'Brien about courage, friendship, and intelligence.
The story follows Mrs. Frisby, a widowed field mouse whose young son, Timothy, is too sick to be moved before the farmer begins plowing the fields. Desperate to save her family, she seeks help from a mysterious colony of highly intelligent rats living beneath a rosebush. She soon learns that the rats gained their extraordinary intelligence after being part of scientific experiments at the National Institute of Mental Health and escaped to build a remarkable underground community.
As Mrs. Frisby helps the rats with a dangerous plan to move her home to safety, she discovers her late husband's connection to the colony and finds the courage to face frightening challenges. The novel explores themes of bravery, selflessness, family, and the responsible use of knowledge.
Best suited for readers ages 9–13, the book is an exciting adventure that combines animal fantasy with science fiction and has become a beloved classic in children's literature.