Don Winslow's SATORI has been described in a number of corners (including one occupied by the author himself) as a prequel to SHIBUMI, the much beloved espionage novel by Trevanian. Following its publication in 1979, many readers clamored for a sequel from Rodney Whitaker, the man behind the Trevanian pen name. None was forthcoming, and Whitaker's passing in 2005 appeared to close the door on any such possibility.
SATORI is far from a sequel, and I wouldn't call it a "prequel" either. It would fit nicely within the boundaries of SHIBUMI as a flashback, given that it focuses on some of the hidden years of Nicholai Hel, the mystic and assassin wh