Erica Leitner knows all about big cities and culture-after all, she grew up in Boston and went to Harvard University. But her idea of the good life is owning a small farm in New Hampshire and digging a garden. So she's come to the town of Rockwell to plant roots-and zucchini-and make this place her home.Jed Willetz got his fill of Rockwell as a teenager and fled as soon as he could. He's back only...