Travels with a Donkey in the Cévennes, Robert Louis Stevenson’s account of his walk through the mountains in 1878, was my mother’s favourite book, which automatically made it one of mine. The brown cover of her 1906 edition is faded with fingering, its pages frayed and loose from her rereadings. Many of the fictional characters who figured largest in my childhood were full of machismo, because they were in books filched from my brothers. Stevenson’s donkey Modestine, on the other hand – ‘patient, elegant, the colour of an ideal mouse’ – was a comforting antidote, domestic and affectionate for all her perceived obstinacy.