Britain's Darkest Taboos - Season 5

The tragic story of Surrey teenager Breck Bednar, who was lured to his death via an online gaming community.

The harrowing story of a used car salesman who murdered his son, estranged wife and her father by setting fire to their home in Chatham, Kent, in 2011 after his marriage collapsed.

On August 9, 2010, Gemma Hayter, a 27-year-old woman with a learning disability, was found stripped, stabbed and beaten to death on the bank of a disused railway track in Rugby, Warwickshire.

The five people responsible for her death included Chantelle Booth, a young woman who Gemma had previously described as her "best friend".

Gemma's family tell us how she had always struggled to make friends because her disability marked her out as different.

Former Detective Superintendent David Swindle and psychologist Emma Kenny examine Gemma Hayter's child-like trust in people and look at chilling CCTV recording that show her being led to her death.

On May 26, 2013, porn-obsessed killer Jamie Reynolds lured 17-year-old Georgia Williams to his home where he hanged her and took photographs of himself sexually assaulting her. He then dumped her body in woodland and went on the run.

Georgia's father Steve, a serving police officer, and mother Lynette, tell us how they discovered the sickening details of their daughter's death and the devastating impact it's had on their lives.

We hear how Reynolds has been jailed for life, branded a potential serial killer and told he will never be released.

Former Detective Superintendent David Swindle and psychologist Emma Kenny give us an insight into Reynolds' twisted mind and reveal the full extent of his morbid fascination in extreme violence against women. Detectives who worked on the case tell us Reynolds stored thousands of images and videos on his hard drive and reveal how he meticulously planned, then acted out his sadistic fantasies on Georgia.

Rana Faruqui's former boyfriend Stephen Griffiths refused to accept that their relationship, which had only lasted a few months, was over and that Rana wanted nothing more to do with him. He stalked her for several weeks and on August 2, 2003, he stabbed her to death with an eight inch serrated hunting blade. Rana was in a field fetching her horse in for the night when she was attacked and repeatedly stabbed.

Griffiths was jailed for life but is eligible for parole in 2017. Rana's mother, Carol Faruqui, and siblings, Simon and Gemma, tell us about their sense of injustice and former Detective Superintendent David Swindle and psychologist Emma Kenny analyse the extent of Griffiths' controlling nature and what drove him to murder Rana.

Christine Chambers found the courage to leave her violent partner David Oakes and to fight for custody of their two-year-old daughter Shania. But on June 6, 2011, Oakes turns up at her home unannounced, forces her to strip and subjects her to a degrading attack, torturing her and telling her "If I can't have you, no one else will".

The attack culminates in Oakes shooting dead both Christine and their daughter two-year-old Shania at point blank range. Oakes is sentenced to life in jail and is told he will never be released – but two years into his sentence he dies of cancer.

Christine's sister tells us how she feels cheated of justice and former Detective Superintendent David Swindle and psychologist Emma Kenny examine the disturbing details of this horrific double murder.

On December 3, 2013, Ben Blakeley flew into a rage and strangled his teenage girlfriend Jayden Parkinson to death after she told him she was pregnant. He dumped the 17-year-old's body in a ditch and then, a few days later, buried her in his uncle's grave. Her body wasn't found for more than two weeks.

Jayden's mother, Samantha Shrewsbury, tells us of her deep sense of loss and how she tried to get her daughter to end her violent and abusive relationship with evil Ben Blakeley.

Former Detective Superintendent David Swindle and psychologist Emma Kenny examine the violent and abusive hold Blakeley had over Jayden and give us an insight into his twisted mind.

Louise Turnbull was subjected to years of horrific sexual abuse at the hands of her stepfather Albert Maughan. Throughout her childhood, she was raped and indecently assaulted by the man she was supposed to trust.

The abuse started at the age of three and continued for the next 12 years.

In April, 2015, Maughan was jailed for 16 years, convicted of 23 counts of historic sex offences including rape and attempted rape.

Now aged 43, Louise has waived her right to anonymity to give her first television interview about her lost childhood. Former Detective Superintendent David Swindle and psychologist Emma Kenny examine the horrific details of this case.