Despite laws designed to ensure modern slavery does not flourish in the supply chains of British companies, the I-Unit discovers contractors who break the law by using coercion against employees while withholding travel documents.

The I-Unit gathers evidence of traffickers recruiting victims in Vietnam and Romania and finds out what happens to those who fall into the hands of people smugglers once they arrive in Britain.

Undercover operatives gain access to drug gangs that exploit trafficked and vulnerable people to run cannabis farms. It also exposes the men who are profiting from the trade of young eastern European women by forcing them to work in the sex industry.