Isabelle Huppert: 'When you're an actor, you keep secrets'

Isabelle Huppert has a way of inspiring intrigue - even without trying. On the red carpet at Cannes last month, she raised eyebrows with her choice of footwear: a pair of Balenciaga Anatomic heels, whose tips are moulded to look like human toes. It seemed like quintessential Huppert: an arch joke about the furore over the festival's insistence on heels for women at events, rising above the idiotic dictate and the barefoot rebels who have recently flouted it. Except apparently I'm overthinking it: "People were looking at my shoes?" asks the actor, in her soigné tones, on the phone from…