Stranded in the Welsh mountains, seven reality show contestants have no idea what they've signed up for. Each has a secret and if revealed they won't just be eliminated - they'll be exposed live on air. The stakes are higher than they'd ever imagined, and they're trapped. And when a murderer strikes, Ffion knows every one of her suspects has an alibi... and a secret worth killing for. They say the camera never lies. But on this show, you can't trust anything you see.