An uninvited guest shows up after Alaric and Jo's wedding, leaving Elena in terrible jeopardy. Bonnie takes matters into her own hands after finding herself on the receiving end of a twisted plan. As Stefan and Caroline reach an emotional crossroad in their relationship, a reunion with Liv leaves Tyler faced with a decision that could change his life forever. Meanwhile, Lily's reckless actions cause Stefan to realize the lengths to which his mother will go to reunite with her "family." Damon is forced to make the most difficult decision of his life.