Mrs. Frisby and the Rats of NIMH
Robert C. O'Brien
 Mrs. Frisby's son, Timothy, is ill just as the farmer Mr. Fitzgibbon begins preparation for spring ploughing in the field where the Frisby family lives. Normally she would move her family, but Timothy would not survive the cold trip to their summer home. Mrs. Frisby obtains medicine from her friend Mr. Ages, the older white mouse. On the return journey, she saves the life of Jeremy, a young crow, from Dragon, the farmer's cat - the same cat who had killed her husband, Jonathan. Jeremy suggests she seek help in moving Timothy from an owl who dwells in the forest. Jeremy flies Mrs. Frisby to the owl's tree, but the owl says he can't help until he finds out that she is the widow of Jonathan Frisby. He suggests that Mrs. Frisby seek help from the rats who live in a rosebush near her. Mrs. Frisby discovers the rats have human-level intelligence, with a literate and mechanized society. They have technology such as elevators. They have tapped the electricity grid to provide lighting and heating, and have acquired other human skills, such as storing food for the winter. Their leader, Nicodemus, tells Mrs. Frisby of the rats' capture by scientists working for a laboratory located at the National Institute of Mental Health (NIMH) and the subsequent experiments that the humans performed on the rats, which increased the rats' intelligence to the point of being able to read, write, and operate complicated machines, as well as enhancing their longevity and strength. This increased intelligence and strength allowed them to escape from the NIMH laboratories and migrate to their present location. Jonathan Frisby and Mr. Ages were the only two survivors of a group of eight mice who had been part of the experiments at NIMH, and made the rats' escape possible. Out of respect for Jonathan, Nicodemus agrees to help Mrs. Frisby's family. The rats move her house to a location safe from the plough. The rats are preparing "The Plan," which is to abandon their lifestyle of dependence on humans, which some rats regard as theft, for a new, independent farming colony. Before Mrs. Frisby's arrival, a group of seven rats led by a rat named Jenner left the colony because they disagreed with "The Plan", and are presumed to have died in an accident at a nearby hardware store. This incident has attracted the attention of a group of men, who never identify themselves, and they have offered to exterminate the rat colony on Fitzgibbon's land free of charge for him. To move the house, the rats have to drug Dragon, the farmer's cat, as it is too dangerous to work in the open without any place to hide. However, Mr. Ages has a broken leg and cannot dash to Dragon's bowl to put in the drug. Since the other rats are too big to fit into the hole in the wall to enter the house, Mrs. Frisby volunteers to go. Unfortunately, she is caught by the family's son, Billy, who puts her in a cage. At night, Justin comes to save her and manages to get her out of the cage. They plan the house move. The successful house move allows the mouse family to remain while Timothy recovers before moving to their summer home. Mrs. Frisby overhears the Fitzgibbons discussing the men during her captivity and reports back to the rats. Thanks to her warning, the rats have time to plan their escape.