The Vampire Diaries: Stefan's Diaries #1: Origins

Set during the Civil War, against a backdrop of grand estates, unimaginable riches, and deadly secrets, three teenagers in Mystic Falls, Virginia enter a torrid love triangle that will span eternity.

Brothers Stefan and Damon Salvatore are inseparable until they meet Katherine, a stunning, mysterious woman who turns their world upside down. Siblings turned rivals, the Salvatores compete for Katherine's affection, only to discover that her sumptuous silk dresses and glittering gems hide a terrible secret: Katherine is a vampire. And she is intent on turning them into vampires so they can live together-forever.