Killer and shark-obsessive Bruce Kane is in hiding, masquerading as a shark researcher in the isolated lighthouse where high school student Courtney and her friends have decided to go swimming. After a fling, Courtney can’t shake Bruce from her life and has to take matters into her own hands when his obsession turns deadly.
On an idyllic day at the beach, Alison and her younger brother, Kevin, are saved from a vicious shark attack by the brooding and mysterious Daniel. Welcomed into their home, Alison soon discovers that her mysterious savior and protector has a dark and disturbing past.
After being forced into early retirement, former detective Jeff Jackson returns to a quiet life on Martha's Vineyard. Quiet, at least, until a body washes up and he's drawn back into crime solving.
선과 악의 대립은 악당의 아이들인 말, 이비, 카를로스와 제이가 잃어버린 제도에 오라돈의 신입생을 모집하러 돌아오며 계속 이어진다. 잃어버린 제도를 떠나려는 찰나, 장벽이 무너지고 오라돈이 위험에 처하자 우마와 하데스의 복수가 두려운 말은 영원히 장벽을 막아버리기로 결심한다. 한편 신비한 어둠의 힘은 계속 오라돈의 사람들을 위협하고, 아이들은 모두를 구하기 위해 여지껏 보지 못한 거대한 전투에 뛰어든다.