In August 1806, Aaron Burr began the final preparations for his mysterious expedition to the western frontier. As he traveled, rumors that he was plotting a dangerous conspiracy followed in his wake.

Newspapers reported that Burr was planning to invade Mexico and start a secessionist rebellion in New Orleans. As evidence mounted, a dogged federal prosecutor resolved to bring Burr into court. But the biggest threat to Burr’s vision of power and glory would soon come from someone he never expected – one of his closest allies.

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