Michelle Boucher is questioned as the team seeks intel on a matter of national security,

Roundtree and the team seek intel on a matter of national security.

Sam and the team investigate a matter of national security.

David Kessler is a sociopath who has been obsessed with Kensi since she put him in jail years ago.

In order to get intel on a matter of national security, Kensi must come face-to-face with David Kessler, a sociopath who has been obsessed with her since she put him in jail years ago.

Kensi comes face to face with a serial killer she put away years before on NCIS: Los Angeles. "Raising the Dead" is the fifth episode of the show's 12th season.