Carolyn Keene 
Bad Times, Big Crimes [EPUB ebook] 

So I was sitting with Ned in a lecture, and then bam, Ned’s in a three-piece suit, and I’m in a city hall meeting on how to get through the beginning of the Great Depression. As in the Depression, in the 1930s. What’s more, there’s a thief to track down. Someone’s robbing local banks of what little money they have. Everyone’s panicked about their money, so the thief could be just about anyone. But after spending just a little time in this odd place, I have a hunch there’s more to it… Bad Times, Big Crimes