Congratulations @sammy00! Amazing skills and knowledge!

I have a guess on the XCIX riddle. I think it's the 1960 film Purple Noon (Plein soleil), directed by René Clément. Starring the brilliant Alain Delon. His hero Tom Ripley kills his rich friend and tries to enjoy his life. Everything almost turned out, but the body of the murdered man was caught by a rope on the propeller of the yacht. And the action of the film begins in Rome.