From publisher blurb:
1610. All of Europe teeters on the brink of war.
A Clockwork & Cthulhu campaign for 4-8 adventurers set in The Rhine River Valley, in The Holy Roman Empire, in the Year of Our Lord 1610.
The Köln Machinations is the second part of a campaign for Clockwork & Cthulhu which started with The Heydelberg Horror.