A young-adult paranormal romance novel connected to The Vampire Diaries universe. Origins is the first book in the Stefan's Diaries series and serves as a prequel, revealing how the Salvatore brothers became vampires and how their rivalry began.

Set in 1864 Mystic Falls, Virginia, during the American Civil War, the story follows brothers Stefan Salvatore and Damon Salvatore, whose close relationship is shattered when they both fall in love with the beautiful and mysterious Katherine Pierce. As their rivalry grows, they discover Katherine's shocking secret—she is a vampire.

The novel explores the origins of the famous love triangle, the transformation of the Salvatore brothers, and the events that turned them from loving siblings into bitter enemies. Filled with romance, betrayal, secrets, and supernatural danger, it provides important background for fans of The Vampire Diaries.