In the third and final book of this action-packed, time-traveling adventure trilogy, Greg and the Musketeers must prevent the Prince of Condé from overthrowing King Louis, or else the past—and Greg’s future—will be changed forever.

Greg Rich should feel invincible. After all, he’s traveled through time, become one of the legendary Musketeers, and—most recently— prevented the Spanish army from attacking Paris. Instead, he and his friends are languishing in prison, having stumbled into a trap set by Milady and the Prince of Condé.

But Greg didn’t come to the seventeenth century to sit in a jail cell and await execution. He, Aramis, Athos, and Porthos need to get to King Louis, who is in immediate danger of being overthrown by the scheming prince. With history at stake, the boys plot to break out, protect Louis, and return Greg and his parents to the twenty-first century. Because if the past changes, what will happen to Greg’s future?

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