When a young mum goes missing, police uncover a troubled marriage. As their prime suspect is seen buying cleaning supplies, they must work fast to put the perpetrator behind bars.

When a 62-year-old man is stabbed in his home, the police must use all the evidence at their disposal to identify and apprehend the perpetrator.

A known gangster with links to the infamous Brinks Mat robbery has been gunned down in a South London suburb. Forensic clues point to the assassins, but who ordered it?

The body of an unknown man, found with violent injuries on a hillside in Scotland, leads the police to uncover a conspiracy involving an illegal taxi service with ties to a gang.

When Sean Humphrey is found dead in his Glasgow home, police use forensic evidence to pinpoint a suspect. They uncover the suspect's identity but catching him proves more difficult.

A drug dealer has been shot dead in Southampton. With very little forensic evidence to go on, police must rely on the description of a witness who got away after the gun jammed.

When a body is found in a pub freezer and police uncover suspicious texts, they must use forensic evidence to track down a gun-wielding killer before he harms someone else.

A Norfolk grandmother is found murdered with strange marks on her face after being spotted with an unknown male who turns out to be a killer posing as a child.

The body of a 17-year-old woman is found in an alleyway in Bolton's red-light district. A tire print is the Police's only lead in a man hunt with dozens of potential suspects.

Kent Police investigate the brutal murder of one of their own - 53-year-old PCSO Julia James. But with no witnesses or CCTV, they must rely on the community for their first lead.