Professional gambler who learns the trade from Kansas John. Travels to New Orleans, becomes entangled with the Dureau family, builds a casino, survives a duel with Laurent, loses his fortune after George Elwood's betrayal, and ultimately returns to gambling with Angelique.
The two men share a mutual appreciation for swordsmanship, bridging their social divide.
George's betrayal directly causes Mark's financial downfall, creating a bitter rivalry.
Caldwell serves as a primary external threat, attempting to eliminate Mark through violence.
Mark harbors early romantic interest in Angelique, which she initially rejects.
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