Lost Recap: The Other 48 Days
The first 30 episodes of Lost have concentrated on the survivors in the fuselage, and only recently have we discovered that there were survivors in the tail section (the "tailies"). This episode tells the story of their first 48 days on the island.
The first night, some of their number were taken by The Others. More may have been lost, but Mr. Eko killed two of those trying to capture them, and that scared them away. As a result of taking these lives, Mr. Eko decided not to talk for the next forty days, a decision that Ana-Lucia didn't particularly like.
Soon, The Others returned to take the children from the group. As a result, the tailies decided to move inland, and soon Ana-Lucia started to dig her pit (seen first in Orientation). She put Nathan in the pit, thinking he was a mole for The Others, but after four days in the pit, Goodwin let him out and told him to get lost before Ana-Lucia killed him. As he turned to leave, Goodwin killed him.
The next day, they found Arrow Station, long ago abandoned by the Dharma Initiative. It still contained a number of goods, however, including a radio, so Ana-Lucia and Goodwin climbed the mountain to see if they could get a decent signal, and it was there that she confronted Goodwin about being one of The Others (and killing Nathan).
Realizing that he had no way out, and no explanation for how he was not wet when he came running out of the jungle after "finding" Bernard in the tree, Goodwin admitted to Ana-Lucia that he was indeed one of The Others, and that the children were fine. Then they fought and Goodwin died when he fell on the stake Ana-Lucia was carrying.
After she came down the mountain, Ana-Lucia told the rest of the tailies that they were safe now and could make camp.
That's when they met Jin, and shortly thereafter, Michael and Sawyer on the beach, and all of them ended up in Ana-Lucia's pit. Ana-Lucia had Mr. Eko hit her, to pretend to be a victim of The Others, and used the sympathy to get close to Sawyer, where she took advantage of the situation to get his gun. Then they started off across the island on their fateful trek that resulted in Shannon's death at the other end of Ana-Lucia's gun.