In the chapter, Think-Tank, the arrogant Martian commander, plans to invade Earth in 2040. His crew discovers a library and picks up a copy of Mother Goose. On reading the nursery rhymes, Think-Tank misinterprets them wildly — believing Earth has silver-growing technology, space-trained cows, and musical animals. When Humpty Dumpty's picture resembles his own balloon-shaped head, he panics, fearing Earth plans to capture him, and orders full retreat to Alpha Centauri. Thus, a simple book of nursery rhymes stopped the invasion and saved the Earth.
Source: The Book That Saved the Earth, Scenes 1 & 2
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The examiner wants you to:
Avoid retelling every detail; pick the most important turning points. Three concise points across ~80 words is ideal for 3 marks.