Police investigate the murder of one of their own - PCSO Julia James. With no witnesses, they rely on the community for help.

The body of a woman is found in Bolton's red-light district. A tyre print is the police's only lead in a manhunt with many potential suspects.

UK 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.

A body is found in a pub freezer in the UK and police uncover suspicious texts. The main suspect is on the run, with forensic evidence pointing to his guilt.

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

When Sean Humphrey is found dead at home, police use forensic evidence to find a suspect. They uncover his identity, but catching him proves more difficult.