Do No Harm

Michael survives the attempt on his life, but Carla's men are still after him. While on the run, he and Sam encounter a suicidal man, who is trying to help his diseased son get urgent medical attention but has lost all his money to a medical scam artist. While tracking down the organization and its mastermind, Michael again enlists the help of Fiona's new boyfriend, causing a rift between them that ends their relationship, even as the team succeeds in getting the money back and putting the scammer in prison. In the meantime, Michael gives himself up to Carla, who tasks him with finding his would-be killer, and he resolves to keep her in the dark, intending to learn all he can about the unknown party for his own purposes.

Boone reveals to Jack that he and Locke have discovered the hatch, and Locke has told him not to tell anybody else. Despite Jack's extensive attempts to save him, Boone dies. Shannon & Sayid have a candlelit dinner. Claire goes into labor and gives birth to a boy. Shannon is devastated over Boone's death. Flashbacks show Jack's wedding to Sarah, a former patient whom he had "fixed" after she was injured in a car accident.