Danny’s ex-wife, Rachel, reveals that her son Charlie—who Danny believed was the biological child of her second husband—is actually Danny’s biological son .
As the first half of a two-hour season finale event, it also sets the stage for the following episode ("A Make Kāua"): [S5E24] Luapo'i (Prey)
In of Hawaii Five-0 , titled " Luapo'i" (Prey) , the team balances a high-stakes manhunt for an escaped killer with a life-altering personal revelation for Danny Williams. Plot Summary: The Investigation Danny is left reeling with anger and grief
Rachel only shares this secret because Charlie is suffering from a rare disease and requires a bone marrow transplant from a close relative. aggressive bounty hunter
Danny is left reeling with anger and grief over the three years he missed with his son, while Steve McGarrett reminds him that saving Charlie’s life must now be the priority. Subplots and Finale Setup
It is eventually revealed that Pelham was being tracked because he murdered the daughter of Malcolm Leddy , a man who plans to torture Pelham as revenge rather than see him return to prison. The "Explosive" Secret
Five-0 must deal with a second, aggressive bounty hunter, Richie Malloy (guest star Brad William Henke), who is also tracking Pelham for the $40,000 reward.