Lewis, Cleo, Emma, Rikki, Zane and Ash are all beginning their final year of high school. Charlotte is gone, and everyone seems happy. Well, at least for the most part. The girls' big secret is a major part of all of their lives now, but none of them realised how much it was all taking a toll on Lewis. One night, Lewis heads to Mako Island to do some experiments and tests, still desperate for answers; and his life changes forever. Lewis should have known it was a terrible idea to go to Mako Island alone on the night of a full moon.