Every so often a story breaks through the everyday news noise to point a finger at something hiding in plain sight.
The death of Hollie Gazzard two years ago tomorrow was just such a story.
A beautiful young woman, making her way in the world as a hairdresser, stabbed to death in the salon where she worked by the man who was supposed to love and care for her - her boyfriend.
As her family reeled from the unbearable shock, a hideous pattern of domestic abuse and psychological control suffered by Hollie in the months leading to her murder rose to the surface.
Asher Maslin had controlled and micromanaged Hollie's life: her finances, her friendships and her freedom.
The appalling violence at the end was a culmination of months of mental torture.
Hollie's sister Chloe Gazzard told me about it:
And it was a pattern of behaviour the police failed to follow up on - the warning signs were all there.
And a damning report into their investigation lifted the lid on the true nature of domestic abuse. The vast majority of it is psychological - crushing lives with cruel control.
And it happens behind more closed doors than you ever might imagine.
It happens in all sorts of relationships whatever the class, background or circumstances. Men are victims too - but the vast majority are women.
Two women a week die at the hands of their partners.
Think about that for a second.
What an appalling statistic in a supposedly civilised society. An unknown number will also commit suicide, driven to despair by a controlling partner.
But now a change in the law should mean a radical change in attitude and handling of all domestic abuse cases.
Now the police can intervene earlier: a new criminal offence of coercive control means they can act, even if there is no incidence of physical assault.
Those lucky enough to escape domestic abuse will tell you how vital a change this is.
We spoke to one young woman who'd been caught up in a whirlwind romance.
Within months, she and her partner had a mortgage and a baby. And then the abuse began.
As we worked on our Tonight programme on coercive control and the change in the law - we heard such stories over and over again.
Women who didn't necessarily suffer a single blow but whose lives were unremittingly being ground down.
Experts say acknowledging and understanding this is crucial to dealing with it better.
And as Hollie Gazzard's dad tells us - if you know someone who might be stuck in the hell of a controlling relationship, take them under your wing, and get help.
- Behind Closed Doors - Fear and Control: Tonight will be broadcast Thursday at 7.30pm on ITV
If you or someone you know is suffering from domestic abuse contact The National Domestic Violence Helpline free and confidential (run by Refuge and Women's Aid) on 0808 2000 247.