Half an hour later, Dignum came to Billy's cell.
Billy snapped "I need to see Queenan, now. I know who the mole is."
"Oh yeah, Who".
"No way I'm telling you, when you said you would trash my files. Costello has sold me to the Feds and will kill me if I am released". Billy refused to say more.
Dignum cursed, trust was vital in this game and Billy had made clear that he no longer trusted him. Dignum phoned Queenan and then gave Billy the phone. Billy told Queenan that Costello did not trust anyone and was using new people to bring stuff in. Costello was also going loco and would kill Billy anyway if he was released to return to the gang. Billy needed out. The mole was Sullivan and Billy was stringing him along.
Queenan temporised, worried by Billy's state of mind. He really needed to see Billy in person but it was too risky, even if he levelled with Ellerby. He told Billy that he had photo-ed two Feds with Costello and the options were to tell the Feds that Billy was a cop, or somehow persuade the Feds to go away. Then Billy could string Sullivan along. With time short, Queenan ordered Dignum to meet him with Ellerby to study the photo's. Then they could decide exactly what to do.