"The beautifully ornate reading room at the Boston Public Library is completely silent one weekday morning, until a woman's terrified scream echoes through the room. Security guards immediately appear and instruct everyone inside to stay put until they determine there is no threat. While they wait for the all-clear, four strangers who had been sitting in the reading room get to chatting and quickly become friendly. Harriet, Marigold, Whit, and Caine...