In 2001 Bruce Thomas Howse murdered his stepdaughters Olympia Jetson and Saliel Aplin as they lay in their beds at their Masterton home.
The girls - aged just 11 and 12 - had suffered years of physical and sexual abuse at the hands of Howse and, despite their cries for help, it never came.
Today A Moment In Crime is about the tragic deaths of the young sisters and the impact on their family, particularly their older sister Alicia.
This episode of A Moment In Crime deals with child abuse, sexual assault and murder and may not be suitable for some listeners.
If you need help or you are worried about someone else - see below for a list of help and support agencies.
On the night of December 3, 2001, Olympia and Saliel had gone to bed in the sleepout of their family's home.
Howse crept out and stabbed them both with a carving knife - Saliel first, and then Olympia.
Howse killed the girls because he found out that they had disclosed his physical and sexual abuse and authorities were investigating.
Child Youth and Family sent a letter to the girls' mother, Charlene Aplin, in November 2001, and on December 3 she picked up the phone and responded.
Howse, who had been reading CYF mail sent to his partner about her daughters, killed the girls hours later.
It would later emerge after Howse was convicted of murder and sentenced to life in prison with a minimum non-parole period of 28 years, that CYF and police had been working with Charlene and her children since the 1980s.
There had been allegations of abuse and violence throughout the years, the children and their mother spent time at women's refuges and the children were also put into the care of their grandparents at one stage.
Today Herald senior journalist Anna Leask revisits the terrible crime and the aftermath.
This episode of A Moment In Crime includes harrowing audio from an exclusive interview with Alicia Aplin, the murdered girls' older sister.
Aplin lived with the abuse, her sisters lived with the abuse - they were simply too scared to tell anyone what was happening in their home.
"I knew if I opened my mouth I'd get a hiding," she said.
"It wasn't just a kick up the bum - it was jug cords, belts shoes, kicked to the point you're thrown against a wall, punched in the face ... broken bones.
"Once Were Warriors had nothing on my childhood."
A Moment In Crime is written and hosted by Leask - who has been covering crime and justice for NZME since 2005.
Leask has also reported on most of the major incidents and events in New Zealand during that period including the Christchurch quakes, Pike River mine disaster, March 15 terror attack and the White Island eruption.
"Each month I'll take you inside some of our most infamous incidents, notorious offenders and behind the scenes of high-profile trials and events to show you what's really happening in your backyard," she said.
"Heroes and villains battle for justice to be done, and it seems no matter how horrifying the story, we always want to know more.
"If you want to know more about the cases that have shocked and shaped our nation - from murders and massacres to violent villains and the utterly unbelievable - join me for A Moment In Crime."
In our first episode, we looked back at the Christchurch terror attack - what unfolded on March 15 and how it changed New Zealand.
CLICK HERE TO LISTEN TO EPISODE 1 OF A MOMENT IN CRIME
The podcast has also delved into the death of West Auckland toddler Aisling Symes, the cold case murder of Kayo Matsuzawa, the murder of Feilding farmer Scott Guy, the disappearance of Jim Donnelly at the Glenbrook steel mill, the murders of Grace Millane and the Kahui twins, the killing of Christie Marceau, and double killer Jason Somerville, infamous for the Christchurch House of Horrors.
In 2017, Leask wrote and hosted Chasing Ghosts - a six-part podcast series on the Amber-Lee Cruickshank case.
The South Island toddler disappeared almost 27 years ago from a small town on the shore of Lake Wakatipu.
Despite exhaustive and repeated searches, there has never been any sign of the little girl.
To mark the 25th anniversary of Amber-Lee's disappearance, Leask investigated the famous cold case in a bid to generate some answers for the toddler's family.
It was the Herald's first true-crime podcast.
To subscribe to A Moment In Crime visit iHeartRadio, Apple Podcasts, Google Podcasts and Spotify.
Are you worried about the safety of a child?
If you have concerns about the immediate safety of a child, call 111.
Alternative call the police non-emergency reporting line on 105.
Or, contact Oranga Tamariki, Ministry for Children on 0508 326 459 for advice or click here to visit the agency's website for more information.
Sexual harm - do you need help?
If it's an emergency and you feel that you or someone else is at risk, call 111.
If you've ever experienced sexual assault or abuse and need to talk to someone contact the Safe to Talk confidential crisis helpline:
Text: 4334
Email: support@safetotalk.nz
Visit https://safetotalk.nz/contact-us/ for an online chat
Domestic violence and abuse - do you need help?
If you're in danger now - phone the police on 111 or ask neighbours of friends to ring for you.
Where to go for help or more information:
Shine: Free national helpline available 24/7 - 0508 744 633 www.2shine.org.nz
Women's Refuge: Free national crisis line operates 24/7 - 0800 refuge or 0800 733 843 www.womensrefuge.org.nz
Shakti: Providing specialist cultural services for African, Asian and middle eastern women and their children. Crisis line 24/7 0800 742 584