"In a large country house in Derbyshire in April 1809 sit Lady Thomasina Coverly, aged thirteen, and her tutor, Septimus Hodge. Through the window may be seen some of the '500 acres inclusive of lake' where Capability Brown's idealized landscape is about to give way to the 'picturesque' Gothic style: 'everything but vampires', as the garden historian Hannah Jarvis remarks in the same room 180 years later to Bernard Nightingale - who has arrived to...