This essay is an exploration of the social and cultural space on the frontier of empire, where sexual and affective transgressions of the taxonomies of race and power were enacted in the eighteenth and nineteenth centuries. It begins with research into the life of a mixed race colonist in early Australia, whose story carried me unexpectedly, and in a circuitous way, into the improbable world of Doll Thomas, a free woman of colour in the eighteenth-century colony of Demerara. Not only does the history of this remarkable woman and her daughters open a little known aspect of slavery and emancipation, it also illuminates the submerged social history at the heart of one of England's most famous novels, Emily Bronte's Wuthering Heights. [Author's abstract]