The Book of Three is the Newbery Award-winning first title in Lloyd Alexander’s classic and excellent children’s series, The Chronicles of Prydain. (Really this is just a classic series, for both adults and children, IMO…)
Book has dropped to £0.99 at Kindle UK. Note that all five titles in this series were on sale at Kindle UK about a year ago, so check carefully before you buy.
Buy at Kindle UK
The Book of Three is now on sale in the US for $1.99…
Kindle US: https://www.amazon.com/dp/B005JDR5PQ
Kobo US: https://www.kobo.com/us/en/ebook/the-book-of-three