Detective Steve McGarrett (Alex O'Loughlin) gets the shock of his life when his mother returns with some earth-shaking secrets in Hawaii Five-0: Season 3. As she weights the dangers of making the revelation that could harm the ones she loves most, her son continues fighting crime with some of the most dedicated cops on the force. But it all threatens to unravel as Kono (Grace Park) gets mixed-up with the Yakuza, Chin Ho (Daniel Dae-Kim) reels in the wake of a tragic loss, and Danny (Scott Caan) realizes he's at risk of losing his daughter.