The Wool-pack by Cynthia Harnett is a book that I first read aged about 11. Recently, I discovered it in the local library and had a happy reread.
The Wool-pack won the Carnegie Medal back in the early 1950s.
This is a "living book". A piece of historical fiction set in the reign of Henry VII with carefully researched detail and occasional black and white drawings.
Nicholas is the son of a wealthy wool merchant from the Cotswolds. He finds himself concerned about some Italian banker visitors and disliking his father's wool-packer. His father won't listen to his worries so Nicholas and his friend, Hal, have to sort things out. This involves a journey across the south of England, a mysterious barn and a map.
There are some fascinating extras, in particular, the story of Nicholas' arranged betrothal to the daughter of a wealthy cloth merchant and the events surrounding Christopher Columbus discovering the New World.
At the end of the book is a postscript explaining which parts of the book are based on fact and which on fiction and where various artifacts can be seen,
I found this book fascinating and recommend it for able readers above about 10. It fits in well with learning about early Tudor England.
Disclaimer: I read a library copy of this book because I wanted to reread it. The opinions are all my own and I have only been compensated with the enjoyment of a well written book.