Castle and Beckett investigate the murder of Will Medina, the assistant curator of the Natural History Museum. The Museum's personnel believe his death is related to the curse of the ancient Mayan tombs.
Callen and Sam work with Navy Captain Harmon Rabb Jr to apprehend spies aboard the USS Allegiance; Hetty tries to neutralise a missile attack in the Middle East; Kensi and Deeks are trapped in a mobile CIA unit in Iraq while under attack.
Following a lead, Lucas visits a strict Amish schoolteacher who may have insights into the murder of Lana Cleary; transferring a captive Chayton proves more difficult than expected.
Alex sends a message to Proctor, while Siobhan receives a blast from the past.
Callen and Sam are aboard a ship that is placed under quarantine for possible Ebola exposure. Kensi and Deeks investigate the murder of a petty officer who recently departed the ship and is linked to the Ebola exposure.
