The hunt is on to find out what happened to Claire. Locke, Jack, Boone and Kate take off on a trail which leads them into a dangerous confrontation with Claire's captor. Jack also discovers Charlie hanging from a tree and manages to save his life when Kate cuts him down.
The back story shows the strained relationship between Jack and his surgeon father. The episode ends on a cliffhanger as Locke and Boone discover something in the jungle...