I remember way back when I was a kid, Eric Van Lustbader was hugely popular. That was in the 80s, and everyone thought Japan was going to take over the world. How times have changed.
A mob boss, fronted by legitimate business is the sworn enemy of Nicholas Linnear, the protagonist of this series. Linnear reminds me of Sir Denis Nayland Smith from the Fu Manchu series, in his outlook.
We get weird esoteric stuff, the history of a mob boss, and his sister, who is a sort of assassin nun, Nicholas Linnear's father, and some Japan setting which would fit right in with almost any book in this genre.
Not bad, but the series seems to be petering out, even though this is the first one I've read.