Great murder mystery or espionage idea…

“This blog is rather like a fusion of the Baroque ‘salon’ with its well-tuned harpsichord around which polite society gathered for entertainment and edification and, on the other hand, a Wild West “saloon” with its out-of-tune piano and swinging doors, where everyone has a gun and something to say. Nevertheless, we try to point our discussions back to what it is to be Catholic in this increasingly difficult age, to love God, and how to get to heaven.” - Fr. Z

Piazza of the 5 moons?? is that correct? please explain
Ma no, sono tutte frottole, non dia retta, Padre…
This is the title of an Italian political thriller (2003) based on the Aldo Moro kidnapping/murder and starring a (dubbed) Donald Sutherland. I suppose – as a title – it’s already been used.
Reference to IMDB entry:
http://www.imdb.com/title/tt0366900/
Hmmm… back to the drawing board.
Surely you would think first of Elizabeth Peters’ old bestseller, Street of the Five Moons?
Though I’m very fond of Peters’ late eighties-early nineties oeuvre in various other series, I’m not real fond of the Vicky Bliss mysteries. (I was never that fond of seventies Gothic romance, period, even if you add in caper, espionage, and comedy elements.) But I’d have thought it’d be hard not to have run across them.