When Locke learns that Boone wants to tell their "secret" to Shannon, Shannon's life is placed in sudden peril, and the shocking truth about her past with Boone is revealed. Meanwhile, Kate is puzzled by Sun's mysterious behavior, and a hungry Hurley must repay a debt to Jin.

After the missing Claire returns with no recollection of what has happened since before the doomed flight of Oceanic 815, Jack and Locke formulate a plan of defense against her kidnapper, the mysterious Ethan, who threatens to kill off the other survivors unless Claire is returned to him.