We found 2 Reddit comments about Shibumi. Here are the top ones, ranked by their Reddit score.
Shibumi by Trevanian features the Basque region prominently and discusses the linguistics.
https://www.amazon.co.jp/Shibumi-Trevanian/dp/0755370236
Shibumi by Trevanian features the Basque region prominently and discusses the linguistics.
https://www.amazon.co.jp/Shibumi-Trevanian/dp/0755370236