The general manager of a luxury hotel is found dead inside an industrial laundry machine; Sherlock offers Joan an apprenticeship.
Locke shoulders the burden of ending the island's increasingly violent movements through time; Ben is stymied in his efforts to reunite the Oceanic 6 and bring them back to the island.
Kate learns that someone knows the secret of Aaron's parentage; the dramatic shifts through time endanger the remaining island survivors.
Ben must try to call the smoke monster to atone for sins of the past.