Meredith and Bailey both have liver transplant patients. Owen needs to look after Harriet.
The team find that they have become targets for Paloma Reynosa, who is trying to fulfil her vendetta against Gibbs.
An American is found dead after clearing his bank account in an apparent suicide outside his hotel in Colombia, and the International Response Team are called to investigate.
The mole has once again compromised the NCIS team as planted evidence results in the arrests of Callen, Sam, Granger and Deeks, on the day Under Secretary Duggan (Jackson Hurst) returns for Hetty's resignation.
There are more tears as the gang say goodbye to an old friend, while Gemma continues to cause tension.