Soil analysis helps solve a 37-year-old murder investigation in Scotland. In Huddersfield, analysis of insect life on a body found on the moors helps detectives catch a killer.

Blood traces hidden under paint allow an expert witness to find a killer and free five men from suspicion. An unusual gait identifies the murderer of an office worker.

Marks left by the tread of a shoe help detectives catch a killer terrorising Rochdale, and a forensic linguist deciphers messages written in slang, revealing a murder plot.

A team of expert witnesses follow a trail of fibres and DNA to solve three cold cases in Pembrokeshire, and a fraudulent diamond investment scheme is exposed by a gemologist.

A body left in a field prompts the examination of pollen, establishing a new forensic discipline, and fibres fused with car wreckage prove who caused a fatal traffic collision.

After 32 years, expert fibre analysis helps bring the killer of two Brighton schoolgirls to justice, and the analysis of bones found on a Yorkshire moor helps find two killers.

Insect evidence helps crack the case of missing Warrington teenager Shafilea Ahmed, and a series of convincing John Anster Fitzgerald forgeries are uncovered by an art expert.

Soil on a spade helps catch the killer of a young woman from Swindon, who for years evaded justice and a stone stuck in the sole of a shoe helps solve a murder in Manchester.

A wrongful conviction is overturned by re-examining microscopic particles on a van seat and an attempted murder outside a nightclub is solved by a facial comparison expert.

Pollen and bone experts help identify the remains of a murder victim found in a sports bag. And advances in DNA help find the killer of a Bradford pensioner after 22 years.

Analysis of text messages reveal a husband's plot to cover up his wife's murder and traces of DNA on decades old evidence helps bring justice to the family of a murdered woman.

Insects establish an accurate time of death, helping to prove a husband killed his wife and analysis of burnt remains in Leeds, uncovers another husband's cold murder of his wife.

Forensics analysis by an art expert prove paintings by a well known cornish artist are fake, and blood spatter patterns in a hotel bedroom, help catch the killer of a father of 3.

A fifty year old cold case murder is solved by DNA and the tenacity of an expert witness. And a murder investigation is solved by tracking unusual blue fibres around the world.