The Nichols Library has started a book group for non-fiction readers. Our first selection is The Ghost Map. It was the summer of 1854. People began dying of cholera, seemingly at random.  A physician and a local curate worked together to isolate the source of the disease. Author David Johnson illuminates the intertwined histories of the spread of disease, the rise of cities, and the nature of scientific inquiry.   The Ghost Map is a good detective story that offers plenty of food for thought. Interested readers can borrow a copy from the library or place a hold for the ebook version at NHDB.  You can call to reserve a copy (253-6950) or send us an email.  We  will meet in a couple of weeks to talk about The Ghost Map over a brown bag lunch (date TBA).