01. A Deadly Secret
It's only when 35-year-old Virginia McCullough is arrested at her home for the murder of her parents that officers discover her gruesome secret.
02. Protecting Holly
A plot to kidnap TV presenter Holly Willoughby is discovered when an undercover cop in the US spots something suspicious in an online chat room.
03. Episode 3
A plot to kidnap TV presenter Holly Willoughby is discovered when an undercover cop in the US spots something suspicious in an online chat room.
04. Episode 4
The discovery of a murdered schoolgirl leads to an international manhunt, and the dramatic arrest of her father and stepmother on an airport runway.
05. Episode 5
After the murders of three schoolgirls, riots break out across Britain. Police are outnumbered but then use cameras to hunt down and arrest rioters.
06. Episode 6
Armed officers confront a crazed gunman at his home, then discover his terrifying plans to carry out a mass shooting at a school and police station.
07. Episode 7
An aristocrat goes on the run with her partner and baby in the depths of winter. Police fear the child won't survive, and race to find her.
08. Episode 8
An affair is exposed, ending in tragedy. Police arrest the suspect and discover the killer's cover-up. Plus, how an arrest solves two crimes at once.