I am afraid you might be disappointed of Under the Yoke. It's too old-fashioned, modelled after French cloak-and-dagger novels, and totally non-PC... Anyway, there was a conference on xenophobia in the Balkans about a dozen years ago, and one of the findings was that, of all notable 19th c. Bulgarian intellectuals, the only one who could be called a Democrat by today's Europan standards is 'Grandpa' Petko R. Slaveykov...