EVOLVE is correct!

Transcript of audio file:

So far, this guy's got me playing from behind. Chasing my tail. But I have a few tricks up my sleeve, too. Like a suspect list. There's three people at the top of my list, each missing something, though. First on my list is Tilly, the ticket taker at the Main Street Cinema. She just seems shifty to me. Cold. Stoic. Freezes up every time I talk to her. But she's missing a motive. Then there's Dave Smith, town archivist and president of the New Century Historical Society. He knows everything that goes on here. He has to know something. Plus, he has access to the newspapers used to cut the letters written on the envelopes. Unfortunately, he doesn't have the means to pull off caper like this. Last, there's Marty Sklar. If there IS a mastermind behind this, he's the most brilliant guy I know. But he's on the other end of town, no opportunity. The strange thing is... I think the thief somehow knows what I'm thinking already. Makes me feel like I'm being watched. As evidenced by getting yet another envelope.