"Loni Mae Murrow's life in Washington, DC is tidy, if a trifle constrained. Single and in her mid-thirties, she's a bird artist at the Smithsonian who spends her days at a desk, making elaborate drawings of belted kingfishers and scrub-jays and purple gallinules. Then she's abruptly summoned back home to the wetlands of northern Florida, where she grew up. Her mother, critical and difficult, has grown frail and been resentfully consigned to assisted...