Les Liaisons dangereuses (Dangerous Liaisons) Part 4, Letters 166-170 Summary

Letter 166: Monsieur Bertrand to Madame de Rosemonde

Bertrand received advice not to press charges against Danceny, as it would ruin Valmont's reputation by bringing everything out into the open.
It's already a public scandal, and this would just make it worse.
Bertrand will await further instructions from Madame de Rosemonde.

Danceny is warned that legal proceedings may be taken against him because of Valmont's death. He suggests Danceny lie low for a while.
Also, since Valmont's aunt is considering suing him, the letter-writer suggests he contact her.

Before leaving Paris, Danceny shares select letters showing Madame de Merteuil's involvement in the conflict between him and Valmont and her trick upon Prévan.
Madame de Merteuil has left Paris as well.
The letters being circulated apparently contain the most scandalous stuff imaginable.
She suspects that Prévan himself wrote the letters to discredit Madame de Merteuil.
Madame de Volanges does not believe the rumors now circulating throughout the city and asks for any inside info that would help her contradict them.

Danceny writes to Madame de Rosemonde and passes on the correspondence that Valmont gave him.
He regrets the pain he's caused her by killing Valmont, but feels he's not to blame.
Two of the letters are copies. He needed to keep the originals of these in order to clear Prévan and to get revenge on Madame de Merteuil.
Danceny says that more letters will be brought to her, but that he's leaving town for now.

Madame de Volanges discovers that her daughter Cécile has left home.
Two hours later she receives a letter from Cécile saying she's decided to become a nun and asking her mother not to ask her why.
At the convent, mother and daughter meet, but Cécile won't tell her what's happened.
Volanges asks Madame de Rosemonde for advice about whether she should make Cécile marry Gercourt, who's due back in town very soon.