Baroness Emmuska Orczy 
The Way of the Scarlet Pimpernel 

The year is 1793, the darkest days of the French revolution, and little Charles-Léon is ill. The delicate son of Louise and Bastien de Croissy is recommended country air, but travel permits are needed — and impossible to come by. Louise’s friend, Josette, believes she knows a way out. For Josette is convinced that her hero, the Scarlet Pimpernel, will come to their rescue. She refuses to believe that he only exists in her imagination.