Callen and Sam work with Navy Captain Harmon "Harm" Rabb, Jr. to locate a group of ISIS sympathizers aboard the USS Allegiance. Also, Hetty enlists her friend Lieutenant Colonel Sarah "Mac" Mackenzie, to help obtain information from a Russian diplomat.
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It's nice to see Katherine Bell, very good episode guest.
But what about Nell? Alyssa Diaz is busy on one of the lead roles in The Rookie and she can't completely replace Renée Felice Smith anyway. Nellverine come back please!
Quite the cliffhanger...and oh so good to see Harm and Mac again.