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Content snapshot
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Violence
Barely any
Mild danger from predators and humans; nothing graphic
Language
None
No profanity
Sexual Content
None
No sexual content
Substance Use
None
No substance use
Emotional Intensity
None
The sadness of animal experiments in the backstory; resolved with hope and community
What this book is about
Mrs. Frisby, a widowed field mouse with a sick son, seeks help from the mysterious rats of NIMH—a colony of super-intelligent, literate animals who escaped from the National Institute of Mental Health. Their secret history and ambitious plans are far more remarkable than she imagined. O'Brien's beloved Newbery Medal winner respects its young readers' intelligence and delivers genuine wonder alongside real emotional stakes.
Notes for sensitive readers
Reader-flagged moments and themes that may affect your experience.
Mild peril and animal deaths
Reader Verification
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