Ep 4. Yellow Jack

As feared in the fourth episode of NCIS: Los Angeles season 11, "Yellow Jack" the deadly disease of Yellow Fever makes an appearance in Los Angeles via a cargo ship arriving from Nigeria. During the routine inspection of the ship, a few of the crew members, as well as a local harbor inspector, started showing symptoms of the deadly disease. This alarming incident then becomes a race against the clock for the team at NCIS: LA to stop the deadly Geographer virus from spreading further.

As the team starts investigating the outbreak during the course of the episode, Nell stays back with Eric to run tests with the little information they have available. But soon the conditions get worse and multiple people end up dying as the virus continues to spread across the city. Meanwhile, the NCIS team finds that the virus was smuggled in and their only lead is a few peculiar phone calls made by the ship's owner, around the time of the sail.

In the meantime, Callen along with Agent Konner joins ATF Agent Paul Angelo to track down an illegal weapons dealer, who they suspect is somehow involved in smuggling the virus illegally into the city. The storyline of the episode then moves forward with the team leveraging their resources to find the origin of the virus before it is too late.

The action and suspense in this episode of NCIS: LA keep the audience on the edge of their seats as the case of the virus outbreak unfolds. The team at NCIS: LA always has to come up with a balance between finding a cure for the virus and preventing it from spreading further.

In the end, the team accomplishes its mission, but at a great cost - both to the city and to one of their own. The characters are tested on many levels in this episode, questioning their limitations as well as being selfless and brave enough to risk their own lives to save others. This episode also marks a shift in the dynamics of the team, where the relationships between team members are highlighted, along with the difficult decisions they have to face in times of crises.

In conclusion, NCIS: Los Angeles season 11 episode 4, "Yellow Jack" is an intense and thrilling addition to the series, showcasing a darker side of the team's investigations as they race against time to handle a deadly outbreak. The actions and consequences of the team's efforts to stop the outbreak make for an engaging and insightful watch.