It began with a lie . . .

Two children are seen on top of a wall in a school.

Shortly later one of them lies fatally injured at the bottom.

Did the boy fall or was he pushed?

As a family liaison offer, DC Maggie Neville has seen parents crumble under the weight of their child's death. Imogen Tyler is no different. Her son's fall was witnessed by the school caretaker and another pupil is under suspicion/being questioned, but Imogen is paralysed by questions. Why was he at the school so early? Why was he with a girl who wasn't a friend?

For Maggie, finding the answers to these questions is paramount if she is to help the mother. But as she investigates, further questions emerge and the truth suddenly seems far from certain. Could the witness be mistaken about what happened and if he is, then who is responsible? And how far will they go to cover up the boy's death?