Months after Damon (Ian Somerhalder) and Enzo (Michael Malarkey) mysteriously vanished from the Armory vault, Stefan (Paul Wesley) tirelessly pushes forward with their search, while Bonnie (Kat Graham) struggles holding onto hope that they will be found. Meanwhile, a dangerous encounter with an unexpected visitor leaves Caroline (Candice King) and Alaric (Matt Davis) fearing that someone – or something – may be targeting their family. Finally, after following some mysterious clues, Stefan realizes that whatever has a hold of his brother may have a more damaging grip over him than he could have ever imagined.