Season 4 Finale: "Angel Of Death"
When NCIS Director Jennifer Shepard returned from an unannounced trip to Paris, her NCIS team wasn't the only group with questions. The CIA found it so interesting that she would go off the grid in a foreign country that they decided to launch an investigation. While her staff worried over a CIA polygraph test, Jenny had something bigger on her mind: finding Rene Benoit, a.k.a. "La Grenouille," one of the most dangerous arms dealers in the world.
Adding to the intrigue, La Grenouille ("The Frog" in French) allegedly murdered Jenny's father, who investigated arms deals for the Pentagon. It appeared he may have gotten too close to the dealers' inner-circle. Jenny spent the last 12 years trying to locate La Grenouille to confront him and exact justice. Her hunger for vengeance turned out to be the motivation for her detour while on an assignment in Paris.
Exhausted from a long flight, Jenny was not prepared for what she would discover back home.
A bottle of the scotch her father used to drink was sitting in her study. Shaken, she had Abby run the prints on the bottle and drinking glass. They belonged to Jenny's long-deceased father ...