Reese tries to protect a software programmer with a mysterious second life, but it’s unclear which side of her life the threat is coming from. Meanwhile, Claire, a young hacker…

When The Machine spits out five numbers, naming the Don of each of New York’s crime families, Reese and Finch suspect Elias is planning to eliminate his competition.

Alliances are forged and broken as the Locke and Jack camps merge.

Juliet is forced to reveal some startling news to Jin when Sun threatens to move to Locke’s camp. Meanwhile, Sayid and Desmond begin to get an idea of the freighter’s…