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. To Alison’s mother, Diana, Daniel is a hero. To Alison’s boyfriend, Carson, Daniel is a threat whose stories don’t quite add up. Daniel charms his way into Diana’s heart and home, but Alison grows suspicious of his odd and protective behavior. When Alison’s loved ones start to go missing, she discovers Daniel isn’t who he says he is, and that he has a dark past with a body count. “Daniel” won’t stop until Alison belongs to him, and she must stop him before Kevin and Diana become his next victims.
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.
Famous country singer John Dalton's concert rehearsal is stalled when the entire crew receives a suicide note from Lita, the band’s bassist. After discovering that a Taser was used to immobilize her before her death, Jenn is skeptical that Lita’s death was actually suicide.
When Mac-Shannon's new beau-first moved to Lighthouse Cove, he bought the historic lighthouse mansion that the town is named after. During renovation demolition, the bones of a teenage girl who went missing fifteen years ago were discovered. If Shannon has any chance of getting the renovation back on track, she'll need to tackle the cold case.