TV-Series
Description
Born in 1855 to the wealthy, bourgeois Laustin landowners of Versailles (later Paris), Isabelle exhibited a fiercely tomboyish nature as a child. She preferred climbing trees, roughhousing with neighborhood children, and dirtying her clothes over conventional feminine pursuits, often bullying her timid friend Jean Clément, calling him a "crybaby" and violently rejecting his repeated marriage proposals.

At fifteen, Isabelle transitioned into society as a "Proper Lady," debuting at a ball coinciding with the Prussian advance on Paris after Napoleon III's defeat at Sedan. Despite her family's bourgeois snobbery, Isabelle possessed an independent mind and strong sense of justice. She felt disgust toward societal inequality and refused blind adherence to custom, demonstrated when she discovered her sister Geneviève's secret romance with the poor piano teacher Jules Francoeur. Recognizing their genuine love, Isabelle kept their secret despite the potential scandal.

Forced to flee Paris for Versailles with her parents, Isabelle witnessed family turmoil: her father disowned Geneviève for marrying Jules, and her brother Andréa died fighting. When her father later proposed she marry Jean to preserve the family's aristocratic lineage, the idea repelled her. Demonstrating lingering stubbornness and physical capability, she challenged Jean to a duel the next day, honoring a childhood vow to only marry someone stronger. Though Jean surprisingly won, Isabelle never revealed her reason and maintained unrequited affection for her sister's former fiancé, Captain Victor.

Isabelle's commitment to resisting the Prussian-backed Thiers government became central. Tasked by Geneviève and Jules to deliver crucial documents to allies in London, she cut her hair, disguised herself as a boy, and embarked on a perilous espionage mission with Jean. This "Attractive Bent-Gender" act was a practical necessity, not an identity struggle. Her resourcefulness and courage faced constant tests—pursued by Thiers' henchmen like Karlov, enduring dangerous situations including a duel, yet receiving unexpected aid from allies like the carriage driver Gaston and the masked Count Red.

The conflict culminated in immense personal tragedy during the Bloody Week massacre. Virtually all Isabelle's loved ones—Victor, Jean, Geneviève (and her unborn child), Jules, Andréa, Gaston, and her parents—were killed, while Thiers faced no repercussions. Isabelle became the sole survivor of her family, staring at Paris's ruins. The final scene implies her resolve to begin anew elsewhere, carrying forward the legacy of those lost, signified by the episode title "Departure for a New Life."