The 22 Letters
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The 22 Letters is a children's novel by Clive King written in 1966.
In the city state of Gebel the master builder Resh has three sons Zayin, Nun and Aleph; and a daughter Beth. The three sons go on three journeys: to Egypt (Sinai), to the court of King Minos (Crete) and north to Ugarit. They return and save the city from invasion with the help of the three inventions they find or discover: celestial navigation, horsemanship and alphabetic writing. Then Thera explodes. Gebel is now known as Byblos.