Series 21

Police need help to find out who killed Shona Stevens in one of Scotland's most notorious unsolved cases. And how the flying squad sent a Colombian gang to jail after they stole more than £1 million.

In December 1984, teenager Lisa Hession was killed near her home in Manchester. Detectives renew their appeal to find her killer. And how police caught the man stealing property from people's gym lockers.

We join a crack unit in the West Midlands as they fight to drive down crime. And Interpol appeal for the public's help with Operation Identify Me.

How a gang of armed robbers terrorising communities across the Midlands were caught. And the family of Italian pizza chef Carlo Giannini ask for help to find their son's killer, who attacked him in a park in Sheffield in 2022.

In 2023, ex-Hollyoaks actress Frankie Jules-Hough was killed with her unborn baby by a reckless driver. Her family have set up a charity in their memory. And the Met appeal for information on the Brixton Academy crush.

In August 2020, a rambler discovered a bag of human remains near the River Stour in Sudbury, Suffolk. All the police know is that the victim was elderly, but they need help with understanding who he was and how he died.

How police caught the man who stole am American Football legend's Hall of Fame ring. And police need help with identifying a man who died near Victoria train station in June 2024.

How detectives caught the man who murdered Ean Coutts, an army veteran from Fife. Plus an appeal from West Yorkshire Police.

In 2023, Carl Cooper was jailed for killing Naomi Hunte and Fiona Holm. Fiona's body hasn't been found. Can you help lay her to rest? And the chase to catch a reckless trio stealing mopeds and joyriding across Peterborough.

In 1994 Lindsay Rimer went missing. Her body was found five months later. Police need help with solving the murder. And police catch a gang using online dating apps to target and attack men.

In 2017, 87-year-old Eileen Blane was attacked and later died from her injuries. Police need to find her killer. And how a violent and prolific car thief was jailed for 14 years.

Kent Police appeal for information, following a violent burglary in Sevenoaks in 2023. And how a glitch on a cryptocurrency trading website led to the theft of over £25 million.

In 2015, Junior Nelson went missing. His body was found the following year. Police and his family need answers. And an incredible story of bravery as police race to evacuate a caravan site.

Fifteen-year-old Robert Williams went missing in March 2002. Police and his family are appealing for information. And how a retired police dog sprang into action to find a missing person.

The Police Service of Northern Ireland appeal for information about Lisa Dorrian, who went missing in Ballyhalbert in February 2005. And how members of an organised crime group supplying drugs across south Wales were caught and jailed.