The next day, d'Artagnan tells Treville about Athos's mistaken arrest. Treville goes to see the king about Athos's arrest and discovers that the cardinal is already there; after much discussion, during which Treville vouches for the whereabouts of both Athos and d'Artagnan during the fracas with Bonacieux, the king and the cardinal both agree to let the matter rest.
Immediately after Treville leaves, the cardinal informs the king that Buckingham is in Paris. The king is certain that with the help of Madame de Chevreuse, the queen and the duke are seeing one another. When he hears that the queen has been writing letters that very morning, he is determined to have her searched and have the letters brought to him. He goes to see the queen and informs her that his chancellor, Sequier, will visit her soon and, at his command, will make a request of her. When Chancellor Seguier appears and searches the queen's room and desk and finds nothing, he prepares to search her person. The queen indignantly refuses, and he is about to use force when she reaches into her bosom and gives him a letter.
When the king opens the letter, he discovers that it is not a love letter to Buckingham; it is a political letter. The queen is asking her brother in Spain and her brother, the Emperor of Austria, to demand the dismissal of Cardinal Richelieu. The cardinal, upon reading the letter, cleverly offers to resign, but the king knows that he cannot manage France without the cardinal's powerful influence.
To make peace with the queen, the cardinal suggests that since the queen loves to dance, the king should give a big ball, and he tells the king that he should insist that the queen wear the diamond tags that he gave her as a present. On returning home, the cardinal hears from Milady that she has secured two diamond tags; she needs money to get to Paris, and as soon as she gets the money, she will be in Paris in four or five days. The cardinal then plots the date of the ball so that he might trap the queen.
