Stop the Clock, Nancy Drew Girl Detective

Just as I'm gearing up to help plan the Mahoney Library's seventy-fifth anniversary celebration, the beautiful old clock, the very centerpiece of the library, is stolen. There's nothing like a good theft to stop a party!
Naturally, I throw down the streamers and get to work. Turns out lots of people wanted that clock -- and what's inside. If I don't hustle, this might become two crimes instead of one....