Nikki Allan was 7 when she was murdered in 1992. (Sharon Henderson)

I see the worst of humanity, the very depths of depravity: I am a reporter on male violence against women and girls. There was a time in Sarajevo, not long after the Balkan war, when I witnessed a dozen women being paraded around a market, naked — their teeth being inspected as if they were farm animals — before they were sold to the highest bidder, to be shipped to brothels. I spent time in a refugee camp in the Middle East, where I heard the screams of girls being sexually assaulted by men as they walked to the latrine in the dark. And I have seen the most violent pornography imaginable.
As a reporter, I am supposed to bear witness: to expose the truth relentlessly and seek justice. I thought I could cope with seeing such horrific things; I would reassure friends that I was fine and point out that I was not the victim in these scenarios. Over the years, I have avoided examining how being immersed in a world of rape, child abuse and femicide has affected me. I would always support those feminist activists who threw in the towel to retire to Spain, but I would feel a bit bemused by their actions. Why would you want to take up gardening, instead of being an agent of change?
Then something shifted. Investigating yet another atrocity, over the past few years, I have been overwhelmed by anxiety and depression, unable to sleep. I now understand why some activists retire.
It began with the murder of a seven-year-old girl. Nikki Allan lived with her mum and three sisters in a run-down block of flats in Sunderland. One day, in 1992, a man took her to the wasteland outside a derelict warehouse and sexually assaulted her. When Nikki screamed, he pushed her through a window into the building, chased her into a far corner, and shattered her little skull with a brick. He then stabbed her 37 times, before dragging her into the basement. There he left her, propped up against the wall like a rag doll.
Police focused their investigation on a man named George Heron, seen as the local oddball. They effectively coerced a confession out of him. The following year, he was acquitted of murder at trial, after the judge ruled the confession out, but was forced to go into hiding because people in the local community were convinced of his guilt. Nikki’s mum, Sharon Henderson, believed Heron had got away with her daughter’s murder, because the police repeatedly told her that there were no other suspects. The media reinforced this narrative.
I picked up the story in 2006. Visiting my parents in Darlington, not far from where Nikki was murdered, I saw a photograph in the local paper of a woman standing by the grave of a child. The headline read: “Mum’s bid to dig up daughter”. Sharon was asking police to exhume Nikki’s body, in order to test it for DNA evidence, following a change in the law on double jeopardy, which prevents someone being tried again on charges of which they’ve been previously acquitted. More than a decade after her daughter’s murder, Sharon was still fighting for justice.