'You've got cancer' are not the words you expect to hear when you're a 40-something marathon running fitness freak who has never even smoked a cigarette. Karen Hockney's extraordinary battle with breast cancer was different in two ways. First, as an Englishwoman living in the south of France, a stone's throw from Cannes, she suddenly had to contend with language barriers and an unfamiliar health system (albeit an extraordinarily efficient one). Secondly, as a leading showbusiness writer who has penned for publications including Hello, The Times and You Magazine, her job was jet-setting around...