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In 1991 – a teenage girl takes a knife to school and commits murder in the middle of a playground full of children. The killing of Diane Watson devastates her family and shocks a whole country. Following her trial, the killer, 15-year-old Barbara Glover, is detained ‘without limit of time’.

But, for the Watson family, the grief and pain is far from over.

Audrey Gillan traces the ripple effects of the murder of a child, by a child – uncovering how the words of two journalists spark a bitter and decades-long crusade which transforms a dinner lady into a ferocious campaigner. One who does everything in her power to change the law, take on a whole industry, and right an historic wrong.