Episode 47 of The Trigan Empire
The Secret Assassin
aka The Assassin
De eerzame moordenaar (Dutch title)
The Honourable Killer (Dutch title, translated)
Written by Mike Butterworth
Illustrated by Philip Corke
The Secret Assassin was originally published in 8 instalments in issues 653 (20 July 1974) to 660 (7 September 1974) of Look and Learn magazine.
It is reprinted in Volume 4 of The Rise and Fall of the Trigan Empire (Rebellion).
Plot summary (Dutch)