A message in blood left by a murdered officer leads NCIS to a manuscript that may contain classified information.
The general manager of a luxury hotel is found dead inside an industrial laundry machine; Sherlock offers Joan an apprenticeship.
Kate learns that someone knows the secret of Aaron's parentage; the dramatic shifts through time endanger the remaining island survivors.
The team looks for a missing teenager while investigating the five-month-old murder of his father, both of whom were in witness protection.
Ben must try to call the smoke monster to atone for sins of the past.