Twenty years ago, Claire and Lydia Scott's older sister, Julia, vanished without a trace. Her disappearance had a devastating effect on their family.Now another teenage girl is missing, and the circumstances of her disappearance are hauntingly similar to Julia's.It's up to Lydia and Claire to revisit their past, unearthing the secrets that destroyed their family all those years ago.But will they be able to face what they find along the way?