1. Megan Newton: The Opportunist Murder

After a teenager is murdered in her flat, police try to find her killer, starting with a set of bloodstained keys.

2. Nadine Aubras

The Opportunist Murder: When a woman is found dead in a hotel, police realise that an apparent suicide is not what it seems, leading to a manhunt that crosses borders.

3. Debbie Starbuck

A woman heads off on an extended honeymoon but her out-of-character contact worries her friends, resulting in a tragic discovery.

5. Michael Ryan

A murder begins a tawdry tale of stolen money, an international escape attempt and an email from the supposed killer keen to sell his story.

6. Sabina Nessa

See how police used CCTV to trace the perpetrator of a crime that shocked the nation - the murder of teacher Sabina Nessa in London.

7. Joy Morgan

A student's strange disappearance becomes a murder investigation, and detectives face a tough task to prove the suspect's guilt.

8. Nicola Stephenson

The Identity Thief Killer: When a woman's body is found in a bin in Lewes, police look for the perpetrator of a disturbing crime.