As a child, it was just a game. As an adult, it was a living nightmare.
'This time it's different. She's gone too far now.
She really has.'
When teenage friends Lizzie and Alice decide to head off for a walk in the countryside, they are blissfully unaware that this will be their final day together - and that only Lizzie will come back alive.
Lizzie has no memory of what happened in the moments before Alice died, she only knows that it must have been a tragic accident. But as she tries to cope...