The BAU must determine the true cause and motive when several drowned people are discovered in the Las Vegas desert.
Ziva witnesses a political assassination and must surrender to the FBI, where she must face the consequences without Gibbs' assistance.
Gibbs' memory temporarily fails him during his recovery, and the NCIS team tries to prevent a terrorist attack without his help.
Gibbs makes shocking discoveries while investigating a respected colleague's murder.
Halstead and Cuevas struggle to diagnose a patient with a rare disorder; CFD and Med staff work to free a paranoid father trapped in the MRI suite; Tanaka-Reed gets an ego check.