Ho'opio 'ia e ka noho ali'i a ka ua (Made Prisoner by the Reign of the Rain) - S9.E15

As a dangerous hurricane hits Oahu, Five-0 is tasked with protecting El Diablo, a captured serial killer who is being hunted by an assassin. Also, Tani's civilian safety check during the storm turns deadly and Rachel and Charlie evacuate to Danny's house, where the ex-spouses reminisce.