Straussman, aka 'Twisted Face', is an evil genius.
He is also a man who is devoting his entire life, all his energies and desires and schemes, to either taking over (his preference) or destroying (his Plan B) the country of England. His hatred for that island nation is all-consuming and anything English is something to be subjugated or eradicated. (I am not sure whether this hostility extends westward to Wales or northward to Scotland. And there is no mention that I found of Ireland. I think it is just the English but unfortunately for those others, they are close enough to be caught up in the turmoil.)
It is important at this point to mention a fellow member of this compendium, , because while Twisted Face, as he is more commonly known to the small number of readers who remember him. Castle is a detective with either Scotland Yard or Special Branch (a bit confusing there) who is one of those in the U.K. who have been thrust into the conflict with Straussman. While there are several adventures of Twisted Face where he will not go up against Castle and there are a couple where Castle will go after other bad guys, there is no doubt these two have enough confrontations as to qualify for the position of 'nemesis' for the other.
...more to come