Right, so figure out whether the two dead scum had the true clues. For now:

Rasputin was in Russia, Robespierre in France. Also Robespierre wouldn't say "Save the Queen". Though it's hard to say if that would make it a bad frame or a really bad true clue.
The clue is "Kill the Queen, save Rasputin". So, maybe something Robespierre might advocate, and Robbiecon = Robespierre.