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Tyler and Caroline are back just in time to watch Klaus, whom Bonnie's spell temporarily locked up in the Gilberts' home while they accompany the Salvatores and Rebekah on professor Atticus Shane's expedition to free Silas from a cave-dungeon on a desolate island off Nova Scotia. Provoked, Klaus manages to stab Caroline so badly that only vampire blood can save her. The expedition, during which Atticus slowly divulges his plans and how his late wife, a witch, cued his whole plan, is plagued by discord, rivalry, conflicting intents concerning the cure and armed mystery assailants. Stefan ends up alone with bitter rivals Elena and Rebekah.