Chap. 1-4
In chapters 1-4, Mrs. Frisby's son, Timothy, gets sick. Mrs. Frisby goes to visit Mr. Ages to ask for some medicine to help Timothy feel better, and he also tells Mrs. Frisby about the Fitzgibbon's plow coming soon, and that she needs to move her house. On the way back home, Mrs. Frisby finds a crow named Jeremy stuck in red string trying to escape. The cat named Dragon is about to come and pounce on him. Mrs. Frisby saves him just in time.
Mrs. Frisby and the Rats of NIMH