"a solitary Woman, dressed from head to foot in white garments"

Such an encounter was recorded by John Millais in his biography of his father, a close friend of Wilkie Collins. Millais's father and Collins were walking together through the then semi-rural North London, when a woman darted across their path, her white robes gleaming in the bright moonlight. While Millais reflected on her beauty, Collins took up the chase. The young woman eventually became his mistress, Caroline. Caroline and Wilkie never married, but they lived together for some 30 years.