After another funeral, tempers rise as the survivors suspicions of each other grow, and an unlikely survivor vows revenge. The events that landed Sayid on Flight 815 play out as he engages Locke in a psychological game of cat and mouse to uncover the truth about the mishap that claimed Boone. Jack goes after Locke believing he had caused Boone's death. Meanwhile, Kate struggles to keep Jack from acting on his rage. Shannon also makes plans for her brother's alleged killer. Claire and Charlie attempt to calm her new baby and Sawyer proves to be the best thing for Claire's very unhappy baby. Sayid's past involves the CIA and a suicide bomber.

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