Jake asks Holt to meet him in an alley in Bensonhurst at 9:00 in the morning. There, Jake reveals that Amy, against Holt's wishes, discovered an informant with incriminating information on Lucas Wint.
The informant is Isaac, a drug pusher for the Bay Ridge Boys. He informs Holt that every Friday he puts cash into a duffel bag and brings it to the Wint Community Center. There, he marks the transaction down as a charitable donation in their account books. This proves that Lucas Wint is laundering money.
Isaac makes a cameo in The 9-8 where he greets Boyle in the bar.