Nancy Drew - Trial by Fire - You'll Do Just Fine

So it's definitely not Ann's source...

“Well, well. Who do we have here?” a voice whispered. “You’re Drew’s kid, aren’t you? I saw you on the TV news this morning. You aren’t who I was expecting—but you’ll do. In fact, you’ll do just fine.”

In other words, this meeting was meant as a trap for Ann, but they're just as happy that Nancy showed up. The man shows her his gun to make sure she complies.

Things sure don't look good for our favorite girl detective, do they?