Whatever the Case May Be

M1, T12: Jack, Kate, and Sawyer fight over possession of a newly discovered locked metal briefcase which might contain insights into Kate's mysterious past. Meanwhile, Sayid asks a reluctant Shannon to translate notes he took from the French woman, a rising tide threatens to engulf the fuselage and the entire beach encampment. Rose and a grieving Charlie tentatively bond over Claire's baffling disappearance.