Dracula by Bram Stoker — the original gothic novel whose Transylvanian setting draws visitors to this region; the castle scenes are vivid even if the real Bran wasn't in Stoker's mind.
Dracula: Prince of Many Faces by Radu Florescu and Raymond McNally — the definitive account of the real Vlad Tepeș and how the Dracula legend grew around him; essential reading for separating myth from history at Bran.
Bradt Romania — the most thorough English-language guide to the country, particularly strong on Transylvania, the Saxon villages, and the Bucegi and Piatra Craiului ranges.
Playing the Moldovans at Tennis by Tony Hawk — a comic account of travelling through Romania on an absurd bet; an affectionate portrait of the country that is still largely accurate about Romanian character and hospitality.