1. Laura May Shatanawi

A few weeks after mother Laura May Shatanawi failed to return home after an exam, her husband reported her missing - but then his secrets came to light.

2. Rania Alayed

Explores the task that police forces and prosecutors across the UK face as they try to get justice for families and prove a murder has happened without the victim's body, a vital piece of evidence.

4. Susan Waring

When Susan Waring's family grow concerned about her lack of contact, she is reported missing. Two months on, police believe the case is a murder investigation.