The Tempest family and friends are gathering for Cassie's eighteenth birthday party. But as they come together, a series of explosive events will threaten everything they hold dear.

Cassie's sister Jess is about to fly to Italy on holiday, but can she forget the horror of what she saw in her flat that afternoon?

Family friend Jenny Barlow has been keeping a devastating secret for years... but for how much longer?

And does the discovery of a dead body on the beach spell danger for one of the Tempests?

Grief, fear, desire and deception all collide as the ties that bind the family are strained like never before. Can they withstand the ultimate stress test?