Jamie's career hangs in the balance when he shoots an armed man in a tourist spot, leading Danny to conduct an investigation into the gunman.
Elizabeth asks the president for help with a dire situation in Western Africa but ends up being faced with unexpected consequences.
Callen and Sam look for a retired assassin who they initially encountered on their first case together.
Alicia pays a visit to long-time client Colin Sweeney, but she finds herself in the unwanted role of witness when a body is discovered in his home.
Don and Megan hunt for a former chemist who is thought to be tampering with over-the-counter medication, causing many people to suffer seizures.