White Ninja
A sadist haunts the back alleys and sex clubs of Tokyo, picking up women, horrifically mutilating them, and leaving behind a calling card written in blood: This could be your wife. He kills fearlessly, certain the police will never catch him.
The only man who might stop this fiend is Nicholas Linnear, a martial arts expert whose childhood education in the dojos of Japan has made him one of the country's leading practitioners of ninjutsu. But Linnear fears that his illness may have left him Shiro Ninja—stripped of his power and discipline. With the killer growing increasingly brazen, Linnear must summon all his strength and training before his own family becomes the next target.
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Eric Van Lustbader
Eric Van Lustbader (born 1946) is a writer of fantasy and thriller novels.
Eric Van Lustbader was born and raised in Greenwich Village in 1946. He is the author of more than twenty-five best-selling novels, including The Ninja, in which he introduced Nicholas Linnear, one of modern fiction's most beloved and enduring heroes. The Ninja was sold to 20th CenturyFox, to be made into a major motion picture. His novels have been translated into over twenty languages.
Nicholas Linnear
Nicholas Linnear consists of seven primary books, and includes one additional book that complement the series but is not considered mandatory reads. The current recommended reading order for the series is provided below.

