Sensei, by John Donohue

This novel is written well and builds a strong sense of interest in the main character, Connor Burke -- a history professor and martial arts enthusiast.   It introduces Connor's family, particularly his brother Mick, a detective with the NYPD.

There are many dojo scenes but the writing is thoughtful and measured; this is not a rough caricature of the genre.

At the moment, this is available for free formatted for the Amazon Kindle.   A crazy approach to marketing, I hope that it works for Mr. Donohue.   For myself, I plan to read more of his books featuring these characters; I expect the next one will be "Kage:  the Shadow." Kage: The Shadow