Grief tears through Hollington Drive when 10-year-old Alex Boyd is declared missing. Sisters Theresa and Helen struggle to hold their lives and families together.

Theresa and Helen are still trying to make sense of the kids' conflicting stories when Hollington Drive is rocked once again: a body has been found.

The pressure is getting to Theresa as the police make their first arrest. With the vigil for Alex approaching, Helen puts things on hold with Gareth - she can't take any risks – there are too many people watching. As Theresa attempts to resume normal life, Ben throws a spanner in the works...

As Colin Chiswick is released from custody and the police resume their investigation, an emboldened Theresa is more determined than ever to pursue the truth for herself, even if it means destroying relationships in the process. Will she finally discover what happened – what tragic sequence of events led to Alex’s death – or will an unsolved mystery hang like a dark cloud over Hollington Drive?