Evidence unearthed by a forensic archaeologist helps to catch the killer of a young woman from Wiltshire. And a case of harrowing neglect suffered by a Welsh teenager is revealed by an insect expert.

A forensically trained dentist's expertise helps police to connect a man to the disappearance of his wife. And the diligent analysis of a soil expert helps to bring convictions against three heritage thieves.

When a decomposed body is washed up on a Dutch beach, a UK facial reconstruction expert helps uncover the identity. And a forensic linguistic specialist leads an international hunt for evidence against an Edinburgh bomber.
 

Detectives hunting the killer of a young woman from Bolton require the help of a fibre and DNA specialist to arrest their suspect. And police seek the help of a body fluids expert after a bizarre rampage in the Cotswolds.

When a British woman is found dead in an Egyptian hotel room, a UK toxicologist uncovers a sinister murder plot. And police turn to a cell communications analyst to solve the vicious murder of a Northern Ireland schoolteacher.

When a teenager's body is located in a shallow grave, a soil specialist is called on to unearth evidence to convict the killer. And as a murder investigation on Merseyside stalls, a fibre expert is enlisted to revive the case.

A fibre specialist from the UK brings closure to Australia's longest-running murder investigation. And a forensic pharmacologist uses her expertise to ensure a murder charge after two brutal killings.

A blood residue specialist leads police to the killers of an East Sussex waiter, brutally bludgeoned in his flat. And a forensic entomologist uncovers a case of extreme neglect when a Merseyside grandmother is found dead in her home.

Police turn to an expert witness to help them link a drug gang to the death of a Vietnamese man in Wales. And experts in DNA and fibre analysis provide the evidence needed to convict the killer of an elderly man in Bristol.

When a young man is stabbed to death, a facial recognition expert helps Merseyside Police catch the killer. And a specialist palynologist's help is needed by detectives investigating the disappearance of an elderly couple.

When two men are wrongly convicted of murder, a forensic blood spatter analyst helps to prove their innocence. And an expert witness uses mobile phone analysis to help police bring a gang of drug traffickers to justice.

When a woman is the victim of an acid attack in Brighton, an expert pieces together hours of CCTV footage to identify the suspect. And through pollen analysis, an expert witness helps police solve a murder case.

When a 21-year-old student is murdered and dumped in the Humber Estuary, a forensic biologist helps police bring her killer to justice. And an expert witness analyses soil at a shallow grave to unearth the truth behind the death of a man in Scotland.

When the body of a farmer is found in a lake, a bioarchaeologist helps police reveal how he got there. Meanwhile, when a man is accused of intentionally spreading the HIV virus, a virologist is called on to determine his guilt.

When a dismembered body is discovered, police turn to a facial reconstruction expert to help identify the victim. And when a man is murdered in Northern Ireland, a cell site expert uses his tracking skills to help catch the killers.