Question: Who was the surgeon's son turned spy sent to St Petersburg, Russia's second largert city?
Sentence (from "Méhée de La Touche"): He returned to Paris after the French Revolution, and was sent to Saint Petersburg as a spy under the name "Chevalier de La Touche" by Honoré Gabriel Riqueti, comte de Mirabeau and Gilbert du Motier, marquis de Lafayette.
Relevant evidence: Yes