by Tessa Boase (Aurum £9.99, 320 pp) Sitting in a London church in 1887, a young woman gazed over the congregation and the sea of elegant ladies’ hats. In her notebook, she jotted down the names of the birds whose feathers decorated those hats — swallows, robins, blue tits, chaffinches, hummingbirds and even eagles and herons. Just as she did every week, she would write to each of the hat wearers, calmly describing the slaughter of the birds who had ended up as their fashion accessories. Today, her name is almost entirely forgotten. Yet, as this beguiling book shows, Etta Lemon is one of...