Reid and Prentiss go undercover to investigate a case of possible child abuse in an underground cult, when a federal raid goes south and they are taken hostage.
Gibbs teams up with FBI Agent Fornell on a joint NCIS-FBI investigation after Fornell becomes the target of a shooting. But they face an unexpected twist in the case when their mutual ex-wife gets involved.
Ray urges Bridget to lie for her own safety, Lee and Ezra are convinced to give Cookie the rights to the music, Mickey plans a robbery, Bunchy struggles with his fears, and Kate visits an inmate.
A full moon leads to some very weird calls for the crew. Athena looks into a potential home invasion, Abby investigates a caller's murder, and Bobby and Buck face a yoga studio full of pregnant women.
The group of first responders band together to search for a missing Maddie. However, they are in a race against time.
