Andrew Thacher

Meredith and Bailey are at odds when both of their patients need a liver transplant. Elsewhere, Owen seeks help from the other doctors when he is charged with babysitting baby Harriet for the day, and Amelia struggles with telling Owen some important news.

Ryan struggles with the decision of whether or not to invite Marissa to his birthday party, and Sandy wants to include one of Ryan's relatives in the celebration. Meanwhile, Julie and Dr. Roberts (recurring guest star MICHAEL NOURI) come clean with Summer and Marissa. Also, Ryan and Sadie (recurring guest star NIKKI REED), along with fellow new couple Marissa and Volchok (recurring guest star CAM GIGANDET), grow closer.

Gibbs must take desperate measures to protect his loved ones with Paloma Reynosa still on the loose.

Complications arise as the Sons band together to face a new adversary.

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 returns for Hetty's resignation.

The International Response Team investigates the apparent suicide of an American in Colombia who emptied his bank account prior to his death.