Twins are literary dynamite. For writers, they’re perfect for thrashing out notions of free will, the pinballing of cause and effect and fate’s arbitrariness. One twin reflects the other, darkly: living proof of the road not taken, the life not lived.

In Maryse Condé’s The Wondrous and Tragic Life of Ivan and Ivana this point is rather laboured — literally, as we first meet the titular pair when they are dragged from the ‘warm and tranquil abode’ of their mother’s womb.