What is the author's style in Stalking the Angel by Robert Crais?

The novel is written completely in English even though many of the characters are of Japanese background. The language and quotes aren't written in Japenese dialect either. The author uses the simplicity in language even for the Japanese characters to emphasize that the true plot of the story doesn't surround the Japanese gang members or the artists. Mimi is the centerpiece of the plot and she barely speaks. Involving other languages would have been distracting.