22 Letters/Rider of the white horse

These books were recommended recently... anyone got a copy??
From wikipedia:
The 22 Letters is a children's novel by Clive King written in 1966.
In the Phoenician 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.

http://en.wikipedia.org/wiki/Rosemary_Sutcliff
Rosemary Sutcliff was a British novelist, best known as a writer of highly acclaimed historical fiction. Although primarily a children's author, the quality and depth of her writing also appeals to adults, she herself once commenting that she wrote "for children of all ages from nine to ninety."
Due to her chronic sickness, she spent the majority of her time with her mother, a tireless storyteller, from whom she learned many of the Celtic and Saxon legends that she would later expand into works of historical fiction. She then worked as a painter of miniatures.