'If you ever tell my secret, you'll be dead to me.'

THE FRIEND: When ordinary mum Frankie moves into her new seaside home, it is a dream come true. Her new neighbours - glamorous Zara, ambitious Nadine and social butterfly Geneva - soon take her under their wing. The four women become inseparable. Until the morning when Geneva's body is found on the beach.

THE HUSBAND: Suspicion is immediately cast on Geneva's husband. Everyone believes he must be guilty. But when the police don't charge him, he vanishes without trace. Now, five years later, he's back.

THE SUSPECTS: And he's not the only one. Soon no one is beyond suspicion. Dark secrets that have been hiding behind closed doors begin to be revealed, with devastating consequences.

But one person will do whatever it takes to make sure that one secret never comes to the surface...