When the Count presses about the letter accusing the Countess of infidelity , PERSON@1 and the Countess reveal that the letter was written by PERSON@2 , and then delivered through PERSON@3 .

When the Count asks her to explain about the letter accusing the Countess of infidelity , PERSON@1 and the Countess explain that the letter was written by PERSON@2 , and then delivered through PERSON@3 .
