Navy SEAL Commander Alex O'loughlin is back in Hawaii to start his new job which sometimes includes working alongside the Five-O Task Force. But it's his personal life that tends to get in the way especially with him seeing Jamie Borth a friend of a friend but when he runs into on and off again girlfriend surfer and model Malia Jones but, things start to get complicated for Alex as he starts up his relationship with Malia again. Will Jamie ever find out that Alex is cheating on her with Malia or not.