Transcript of audio file:

What do we know? Only that the thief is perpetually one step ahead. But we have some clues. They either have the experience to enter and exit a room without being detected or they were known to the victim. They seem to be targeting me specifically, so they have an agenda. And we can cross off Marty Sklar from the suspect list, the thief wouldn't know I was on to him and then lead me directly to his own doorstep. Or would he? No, Marty is a sweetheart, couldn't have been him. Our two other suspects are still viable, though. And I think I'm finally getting ahead of our perp, there's no envelope here…

Woman's voice: Detective? I think this envelope is for you, it fell under the bookcase.

Detective: Uh.. oh, thank you. (sigh)