The murder of Cambridgeshire 10-year-olds Holly Wells and Jessica Chapman in 2002. Experts study media interviews of their killer, Ian Huntley, to expose his lies.

The case of Tracie Andrews, whose 1996 road rage attack killed her lover Lee Harvey. Plus, Hampshire businessman Mike Gifford-Hull's TV plea for his missing wife Farsi that hid the true facts of her disappearance.

The murder of building society manager Carol Wardell in September 1994, by her husband Gordon. Plus, the `honour killing' of 17-year-old Shafilea Ahmed in September 2003, suffocated by her parents Iftikhar and Farzana.

The case of paralympian Oscar Pistorius, who shot his girlfriend Reeva Steenkamp dead in 2013. He claimed it was an accident, but there were suspicions he was falsifying evidence.

The case of John Tanner, who took part in a police reconstruction when his fiancée vanished. Plus, Paul Dyson whose TV plea for his missing lover raised suspicions. Series examining the phenomenon of criminal cases where people publicly feign innocence about a crime they have committed, shedding crocodile tears in the process.

The murder of best-selling author Helen Bailey by her partner Ian Stewart, who had earlier helped volunteers in her search. The 51-year-old's body was eventually found dumped in a cesspit beneath the garage of her £1.5million home in Royston, Hertfordshire, alongside that of her dog in July 2016. She had been drugged and suffocated.

The cases of Miles Evans and Fadi Nasri. Evans murdered his nine-year-old stepdaughter Zoe in 1997, but before her body was recovered he sat alongside her mother in an appeal for the public's help in finding her. In 2006, Nasri asked for help in finding the person behind a fatal knife attack on his wife Nisha, though in reality had hired two men to perform the killing to claim her life insurance.