Seven people. Separated by time. Joined by a terrible secret that won't stay buried. Twenty-six years ago in Edinburgh, seven teenagers spent a year together in an experimental home for highly intelligent but dysfunctional adolescents. They all left The Unit. But it never left them. Innes Haldane has spent years forgetting those dark days. But when a message on her answerphone brings it all back, she's forced to face her past and two very recent deaths... What happened that could be terrible enough to still hold the seven in its thrall? And what bloody reckoning awaits them all?