The XXX has what character?
The Killing Machine
The Killing Machine (1964) is a science fiction novel by American writer Jack Vance, the second in his ``Demon Princes'' series, in which Kirth Gersen, having brought arch-villain Malagate the Woe to justice, sets his sights on Kokor Hekkus, another of the Demon Princes.
Kirth Gersen