In the latest turn of events, D'Artagnan reunites with his companions—Athos, Porthos, and Aramis—to recount the mysterious disappearance of the man from Meung. D'Artagnan concludes that the individual who abducted Madame Bonacieux is the same "mysterious man" he previously pursued. He posits that the kidnapping is inherently linked to the Queen's affairs, asserting, "I believe the cardinal is behind this." Viewing the Cardinal as a direct "enemy of the queen" and consequently a threat to their own cause, D'Artagnan rallies his friends to thwart the Cardinal's plans, despite the inherent risks to their lives.
The political tension escalates when Monsieur Bonacieux arrives at D'Artagnan's apartment, pleading for protection just as the Cardinal's guards appear to arrest him. Recognizing that a direct confrontation would result in their own imprisonment, D'Artagnan advises the landlord to submit, whispering, "we can only save you by remaining free." In the wake of this encounter, the four friends solidify their bond. Holding their swords together, they commit to the iconic motto: "All for one and one for all." This moment marks a turning point; as D'Artagnan declares, "From now on, we are at war with the Cardinal."
The narrative intensifies when D'Artagnan, keeping watch through a hole in his floor, observes men in black invading the apartment below. Hearing the cries of a woman identifying herself as "Madame Bonacieux" and a servant of the Queen, D'Artagnan acts with desperate urgency. He initiates a chaotic rescue, marked by the "clash of swords and the smashing of many pieces of furniture," eventually driving the Cardinal's agents away. Upon securing her safety, he reveals the gravity of the situation: "Those men were more dangerous than thieves; they were agents of the Cardinal."
Madame Bonacieux explains her escape, noting she "climbed through the window" of her prison. D'Artagnan transports her to the safety of Athos’s residence before heading to the palace to relay her location. During this period, D'Artagnan undergoes a profound emotional shift. He finds himself falling in love, viewing her as the "ideal of love"—a woman who is "beautiful and mysterious." His desire to be a "hero for her" complicates his duties, leading him to seek advice from his friend Aramis.
As D'Artagnan approaches Aramis’s home, he observes a suspicious figure "crouching in the shadows." Fearing a trap set by the Cardinal, he is surprised to discover the figure is none other than Madame Bonacieux herself. Her presence outside Aramis’s home leaves the reader questioning her motives and the next stage of this dangerous game of espionage. The musketeers are now fully embroiled in a high-stakes conspiracy, balancing their duty to the Queen, their loyalty to their new motto, and D'Artagnan’s burgeoning romantic obsession.