Sullivan is unaware that Madolyn had an affair with Costigan when she tells Sullivan that she is pregnant. Later, Sullivan finds her listening to a CD from Costigan containing incriminating recorded conversations between Costello and Sullivan. Sullivan unsuccessfully attempts to assuage her suspicions. He then contacts Costigan, who reveals that Costello recorded every one of their conversations, that Costello's attorney left Costigan in possession of the recordings, and that Costigan intends to implicate Sullivan. The two agree to meet at the building where Queenan died.