The narrative opens within the grim confines of the Bastille, where Aramis, now a bishop, orchestrates a clandestine meeting with a young prisoner. The atmosphere is heavy with tension as Aramis enters the cell, signaling for the guard to leave them in private. The prisoner, a young man whose face is "half hidden by his arms," initially reacts with a "cold, strong voice," revealing his deep-seated resentment and isolation. This encounter serves as the catalyst for uncovering a long-buried history that links the prisoner to the highest echelons of the French monarchy.
Aramis prompts the prisoner to recall his early life, specifically mentioning a lady in "black silk" with "fiery ribbons in her hair." These memories trigger a realization in the young man: he remembers a man who looked like a "great musketeer" visiting him, a man he now recognizes as Aramis. The prisoner recounts his upbringing, noting that he was raised as a "well-rounded nobleman" by his tutor and nurse, Perronette. This upbringing stands in stark contrast to his current status as a captive, raising the central question of why someone would invest so much in his education only to condemn him to a life in a dungeon.
The core of the conflict centers on a "fateful morning" eight years prior. The prisoner overheard his guardians panicking over a lost "queen's letter." Driven by curiosity, he retrieved the document from a well. Despite the water having "faded the writing," he deciphered enough to understand his own significance: the letter contained "specific instructions about Philip"—his own name—and revealed the Queen’s desperate attempts to have him "taken away from France" to protect him from the King. This discovery proved to be his undoing. As Aramis notes, once the Queen learned he had read the letter, she feared he had uncovered "the great secret she so desperately wanted to protect," leading to his immediate arrest and imprisonment in the Bastille.
Aramis confirms that the young man’s plight is a direct result of the power of this secret. By labeling the prisoner’s enemy as "great and powerful," Aramis highlights the existential threat the boy poses to the crown. The prisoner realizes he is not merely a victim of circumstance, but a pawn in a high-stakes game of royal survival. As the dialogue concludes, Aramis prepares to divulge a truth that has been "thought to be dead and buried," setting the stage for a dramatic shift in the young man's destiny. The interaction underscores the theme that in the world of the Bastille, knowledge is not just power; it is a sentence of imprisonment.