Sébastien and Mathilde play war in the Napoleon style, before leaving for Waterloo to meet seasoned re-enactors who tirelessly replay the last battle.
Sébastien is parachuted in Ajaccio where he is desperately trying to understand who loves and who doesn't love Napoleon in his hometown. Mathilde, in Paris and Fontainebleau, begins her investigation with a medium, an overexcited curator and a historian of feminist struggles.