Gibbs teams up with FBI Agent Fornell on a joint NCIS-FBI investigation after Fornell becomes the target of a shooting. But they face an unexpected twist in the case when their mutual ex-wife gets involved.
Appearing unexpectedly at Mystic Falls High, Rebekah wastes no time trying to force Stefan, Elena and Caroline to answer her questions about the search for a cure, leading to a bombshell piece of information from Elena.