When Hurley becomes obsessed with the French woman and heads into the jungle to find her, Jack, Sayid, and Charlie have no choice but to follow.
A violent convict escapes from an island prison in search of his stolen money and McGarrett's estranged sister arrives from the mainland.
The team look into the murder of a conspiracy theorist who had compelling information on JFK's assassination.
The Five-0 team find themselves in difficulty as they go up against the mob, as Junior's friend witnesses a hit on a former boss.
When Rick is asked to assist with a federal investigation of his childhood friend Robbie, Magnum launches his own investigation to see what the federal agents really have on him; Kumu goes under cover in a retirement community.