S14·E15 Pandora's Box (I)

Episode recap

Task: Write a 280-380 word episode recap for NCIS S14E15 (Pandora's Box (I)).
Constraints:
Use ONLY verifiable facts from the provided SYNOPSIS and SOURCES.
No invented/guessed titles, names, dates, counts, awards, ratings, etc.
If a detail is missing, omit it.
Style: Original, neutral, encyclopedic prose in plain text.
No markdown, no asterisks, no headings, no bullet points.
Word count target: 280-380 words.
Synopsis: Abby's homeland security think tank is compromised. Abby is found in possession of a real bomb. The NCIS team discovers the leader of the group has been murdered. A theoretical terror playbook has been stolen. This is part one of a crossover that continues on NCIS: New Orleans S03E14 "Pandora's Box (II)".
Source [1]: General info about NCIS (Crime, Drama, Action & Adventure).
Source [2]: Created by Donald P. Bellisario, Don McGill. Cast includes Sean Murray, David McCallum, Mark Harmon, Brian Dietzen. Follows the Major Case Response Team investigating crimes connected to US Navy and Marines Corps personnel and families.
Source [3]: Cast/Crew info.
Source [4]: Mentions Pauley Perrette played Abby.
Source [5]: Mentions Sean Murray, Brian Dietzen, and Rocky Carroll.
Episode Title: Pandora's Box (I).
Series: NCIS.
Season/Episode: Season 14, Episode 15.
Plot: Abby's homeland security think tank is compromised. Abby is found in possession of a real bomb. The NCIS team discovers the leader of the group has been murdered. A theoretical terror playbook has been stolen.
Crossover info: The story continues in NCIS: New Orleans S03E14 Pandora's Box (II).
Context: NCIS follows the Major Case Response Team investigating criminal cases connected to the US Navy and Marines Corps personnel and their families.
Drafting attempt 1:
The NCIS episode titled Pandora's Box (I) is the fifteenth episode of the fourteenth season. In this installment, the homeland security think tank associated with Abby is compromised. During the course of the investigation, Abby is found to be in possession of a real bomb. As the NCIS team investigates the situation, they discover that the leader of the group has been murdered. Additionally, the team learns that a theoretical terror playbook has been stolen. This episode serves as the first part of a crossover event, with the narrative continuing in the NCIS: New Orleans episode titled Pandora