Gordon and Sarah Rutherford are normal, happy people with rich, fulfilling lives. They have a son they adore, a house on the beach and a safe, friendly community in a picture-postcard town.

Until, one day, Bonnie the labrador comes in from the beach alone. Their son, Rory, has gone – the only trace left behind is a single black sandal.

Their lives don’t fall apart immediately. While there’s still hope, they dig deep and try to carry on.

But as desperation mounts, arms around shoulders become fingers pointed – at friends, family, strangers, each other. Without any answers, only questions remain. Who can they trust? How far will they go to find out what happened to Rory?

And the deadliest question of all: what could be worse than your child disappearing?

When the truth begins to emerge, they find themselves in a world they could barely have imagined.