The NCIS team uncovers evidence that determines who shot Callen six months ago and why.
Two FBI agents are killed during a shootout with bank robbers. The unit is led by Don's former mentor and the team learns that everyone's story doesn't quite match up.
Allison's visions could help prevent a massive bio-terror attack when samples of a deadly viral disease go missing. Also, Scanlon is ready to propose to Lynn, but Bridgette's dreams could foreshadow problems on the horizon.
