L'Affaire Tournesol
The king is noticeably absent from the other stories set in or involving Syldavia: "The Calculus Affair" and "Explorers on the Moon". Both were set after World War II, at a time when the various Balkan monarchies providing models for the fictional Syldavia had been overthrown and their rulers exiled. It is not clear what form of government is in power in the post-war Syldavia.