After the crown prince’s death, Sweden was desperate for a new heir. Most wanted a Danish royal, but Carl Otto Mörner, brother-in-law to Gustaf Wetterstedt, had another idea. He asked Wetterstedt for permission to go to Paris on official business—then secretly approached Jean-Baptiste Bernadotte, one of Napoleon’s marshals, and offered him the Swedish crown. Whether Wetterstedt knew or not, no one can say—but Mörner’s gamble changed Sweden’s history.