Quest Red

See how, in the 1993 World Trade Center bombing, DNA was traced to the bomber through the saliva that remained on the back of a mailing label.

Crime writers know as much about crime as any crime-fighter - or criminal. They can provide as near a first-person account of a murder as is possible.

A closer look at real FBI cases - from murders to robberies - with dramatic re-enactments and interviews with agents and forensic scientists who work in the investigations.

A closer look at real FBI cases - from murders to robberies - with dramatic re-enactments and interviews with agents and forensic scientists who work in the investigations.

Judge Rinder examines the real-life case of Debbie Davey, who fell victim to an elaborate scam orchestrated by a very close friend.

Morris Blankenbaker is a happy family man until he gets thrust into a love triangle with his friend and wife. But hidden rivalries lead to his chilling death.

When Father Rivera is called in the middle of the night to perform the last rites for a dying man, the night ends with the priest's shocking murder.

When patients at a Texas hospital start mysteriously dying in the intensive care unit, police rely on surveillance footage to track the perpetrator.

When April Barber was murdered at a remote beauty spot, her husband said he tried to stop the killer and even appealed for help on TV. Experts analyse his deception.

After years of searching for love, Doris thinks she's finally hit the jackpot with an old friend named Mark. But something dark is taking hold of their marriage.

Move On. Popular and outgoing, Rowena aspires to be a teen psychologist. But her dreams turn into a nightmare when a pathological love connection shatters everything.

When Erika Verdecia goes missing, her family launches their own search for her. What their homegrown investigation uncovers is a tragic trail of bloodshed.

In September 2012, Dale Cregan murdered PC Nicola Hughes and PC Fiona Bone, after luring them to a callout by making a false 999 call.

When Hope Melton vanishes after being run off a road, CCTV footage from a nearby gas station reveals a suspicious car. Can police find Hope before it's too late.

After a store robbery turns into abduction, Texas Ranger Jim Holland tracks a suspect to a motel and presses for the missing owner's location.

After a nine-year-old girl is caught in the crossfire of a gangland feud, a specialist weapons team moves in to arrest her killer.

Family man Richard Arenas is gunned down in broad daylight. With no apparent motive or witnesses, can investigators track down his killer on CCTV.

A serial killer is preying on male prostitutes and mutilating their bodies; can police catch him before he strikes again? Plus, a divorce case ends in murder.

The disappearance of an elderly vagrant leads police to the drug-dependent landlady who has killed seven victims for their social security cheques.

In 2014, Jessica Padgett disappears. Surveillance cameras show her driving into a parking lot and walking down an alley, never to return. What happened to her.

In 2011, Patty Ayala is murdered at the Burger King where she works. Police turn to surveillance video - and see a brutal killer emerging from the shadows.

A good coroner provides what is necessary to solve a crime. A bad one can ruin an otherwise rock-solid case.

A makeshift coffin conceals a body - can insects help cops identify the corpse? Plus, a parasite expert proves murder when a woman is found in a dumpster.

A closer look at real FBI cases - from murders to robberies - with dramatic re-enactments and interviews with agents and forensic scientists who work in the investigations.

A closer look at real FBI cases with dramatic re-enactments and interviews with agents and forensic scientists who work in the investigations.

In September 2012, Dale Cregan murdered PC Nicola Hughes and PC Fiona Bone, after luring them to a callout by making a false 999 call.

When 15-year-old Becky Stowe mysteriously disappears, everyone she knows is a suspect. It'll take a surprising tip to finally bring the truth to light.

Will an odd text sent from a mother to her daughter be the critical clue that transforms a missing person's case into a homicide investigation.

Big. In 2010, 36-year-old barman Dexter Bain was brutally killed during a failed robbery. Detectives use CCTV footage and stage a sting operation to prove who pulled the trigger.

When Laci Peterson went missing, her husband claimed he last saw her before he went fishing - but his secret mistress exposed his lies. Experts examine his behaviour.

Roger Harris and his wife Donna built their dream home in Florida, but just after the birth of their second son, a vile secret threatens their sweet, simple life.

To grandparents Ron and Kay Wilkson, family comes first. But in 2016, something evil is prowling close to home, and not everyone will make it out alive.

Pam Jacobs reveals the dark truth about her father. Growing up, she never realised he was a fugitive suspected of the murders of various coin shop owners.

A young woman's ex-boyfriend refuses to take no for an answer. Plus, a young father is left fighting for his life after a brutal assault.

When Rhonda Daugherty vanishes, detectives turn to the public for information. A tip leads to surveillance footage from a hotel that uncovers a journey of deceit.

A young mother begins to wonder if her once-happy, sweet boy is evil, but she could never imagine the true terror her son would become.

When it dawns on George and Margaret Keller that their son hides an evil secret, they are forced to make a heartbreaking choice whether or not to betray their own child.

Emily Lambert goes missing after spending the night at a hotel bar. Two days later, she is found murdered. Can investigators track down her killer on CCTV.

A woman's severed torso is pulled from the Mississippi River; can police identify the victim and catch her killer? Plus, a state trooper makes a grim discovery.

A young woman's body is found in the trunk of a car, forensic clues lead to the killer of a 19-year-old boy and a police officer does the unthinkable.

In 2009, Philip Gattuso is murdered in the quiet town of Fargo. When police can't find any leads, they turn to a witness that never sleeps - surveillance video.

In 2014, Kimberly Robertson's battered body is found on a sidewalk after a date with her boyfriend. Can CCTV footage help detectives identify her killer.

When homicide investigators meet crime writers, it transpires that real-life stories are often stranger than fiction.

A look at when there are no eye-witnesses to murder, photographic evidence can provide investigators with a permanent record of the killer.

When a little girl is abducted the FBI race to locate their prime suspect - a drifter on parole for kidnapping children - but will they find him before it's too late.

Re-examines the investigation into a US bank heist of 1997, in which two armed men opened fire on staff and police officers at close range without mercy.

A young woman's ex-boyfriend refuses to take no for an answer. Plus, a young father is left fighting for his life after a brutal assault.

New in town, Rhonda Smith, finds herself not only with a new job but also a new enemy. After tempers flare Rhonda is discovered barely clinging to life.

Will a terrifying witness account lead a small-town police department in the wrong direction as they try to solve the brutal murder of their friend.

An escaped inmate brutally murders a respected correctional administrator at her home outside the prison in Tennessee. It sets police on a frantic manhunt.

In Elgin, Scotland, a young mother goes missing in 1998. Investigators fear they will never find out what happened until they discover the killer made a key mistake.

A Delaware mum loves a night out on the town. But what starts as innocent fun will lead this 40-year-old down a very dark path paved with jealousy and deadly rage.

On the surface, police officer Albert Pacheco and his wife Cathy live a charmed life in Hawaii. But this seemingly perfect household is hiding something evil.

He Almost Got Away With It. Timothy Bass got away with murder for decades, telling his wife, Gina, he was working the night shift. She believed him until she uncovered his secret.

Europe's Biggest Cocaine Bust And Heist. The UK's coastal agencies come together to stop a ship suspected to be carrying an illegal cargo, sparking a race to find evidence of the stash.

Where's Mom? A loving wife and mother is found brutally murdered at home in Edmond, Oklahoma. Can security camera footage help detectives hunt down her killer.

Where Is Judith? A 60-year-old woman disappears from her rural Florida home in the night, and authorities uncover a similar nightmare just across the county line.

Friends are stunned when an esteemed criminal law professor is executed in his garage. Investigators follow a series of leads that take them on a state-wide hunt.

A police officer is shot dead at point blank range at the Harris County Courthouse outside Houston, Texas. With no witnesses, can security cameras lead to his killer.