Camper English’s new book Doctors and Distillers is the kind of summer read that cries out to be enjoyed with a spirit or cocktail in hand. An appropriate choice would be a small glass of Chartreuse. This potent elixir, inspired by a manuscript from 1605 and developed over centuries by Carthusian monks into a secret formula boasting a complex blend of 130 botanicals, is one of the most beguiling spirits in the world.