Jemma knows who did the murder. She knows because he told her and she can't tell anyone. Fourteen-year-old Jemma has severe cerebral palsy. Unable to communicate or move, she relies on her family and carer for everything. She has a sharp brain and inquisitive nature, and knows all sorts of things about everyone. But when she is confronted with this terrible secret, she is utterly powerless to do anything. Although that might be about to change.