A leak of classified information from the CIA puts the lives of several operatives at risk, so the team works swiftly to expose the mole.
Jack's determination to formulate a plan of action is met with resistance from those close to him; Locke assigns Ben a difficult task.
Locke and Jack merge their camps, forging -- and breaking -- alliances.
Sayid's life is in danger after he discovers the source of the mysterious French transmission; Hurley concocts a funny plan to bring civility to the island.
Locke must enlist the help of an unlikely ally when the hatch takes on a life of its own.