Two seasoned investigators go on a dramatic hunt for one of Europe's most-wanted crime bosses. Codenamed Scorpion, he’s smuggled thousands of people into the UK and is on the run. Show more

It's already late when the BBC team get a tip off that Scorpion's network of complicit lorry drivers might be operating from a new pick-up point. They stay hidden as events unfold. Show more

The job of policing smuggling gangs is obstructed by a network of well-wishers who want to help refugees and sometimes end up helping the gangs - has this happened with Scorpion? Show more

Word comes that Scorpion has been spotted in Turkey and new leads take the team into the heart of the smuggling network, with dramatic developments as they stake out an address. Show more

Two seasoned investigators go on a search for one of Europe's most wanted men: a people smuggler on the run, whose codename is Scorpion. He has transported thousands of migrants. Show more

In this episode we hear transcripts of police surveillance tapes broadcast for the first time as officers eavesdrop on calls between members of the Scorpion people smuggling gang. Show more

The search takes us deep into Scorpion's gang and the men arrested and imprisoned for people smuggling and then things take an unexpected turn as we find and confront his brother. Show more

Scorpion has been spotted in Iraq and Sue and Rob head straight there - hoping to find his hiding place and lure him out. Will they finally be able to confront him with his crimes? Show more

Sue and Rob uncover new evidence linking Scorpion to deaths at sea. They track him to a luxury seaside villa and hear from a woman close to him about the drugs and money he craved. Show more

The series attracts worldwide publicity and attention falls on how the BBC managed to do what law agencies couldn't: finding and questioning a convicted people smuggler on the run. Show more