Jack and the squad search for a celebrity couple's Sudanese 2-year-old adopted son, who is kidnapped from his home.
Unit Chief Jack Garrett and his international response team are called to Tanzania when a 23-member church group disappears.
Mr Eko has dreams about his brother leading him somewhere. He seeks Locke's help in finding a secret location, the question mark `?', but both have a hard time getting along on the way there.
Haunted by visions of his past, a delirious Mr Eko is stalked through the jungle by the mysterious black smoke. Can Locke find him before it's too late?
Eko's life before the crash is revealed, Claire's discovery of the contents of the Virgin Mary statue prompts her to lose faith in Charlie, and Kate gives the recovering Sawyer a much-needed haircut.