Meredith volunteers to run the ER for a night in hope of proving that she is chief-resident material; Bailey and Eli get into mischief; Adele comes to the hospital as a patient.
The team heads to New Orleans to find a perpetrator who has resumed killing after going quiet for 15 months. Meanwhile, Reid struggles with being a hostage.
Gibbs makes shocking discoveries while investigating a respected colleague's murder.
A distraught pregnant woman claims her child is a product of rape and threatens suicide, but the detectives become suspicious when the woman appears willing to settle for cash at the trial.
NCIS investigates after two men are blown up by their own explosives while attempting to break into a military base; Callen wants to take the next step with Anna; Sam moves in with his father.