In this edition, Michelle Ackerley is at Hendon Police College to learn what it takes to be a detective. The team also go behind the scenes with a specialist unit of detectives to hunt down foreign fugitives hiding out in London.

Today, Michelle Ackerley meets the extraordinary dogs training to join the police at the Thames Valley Police Training Centre in Sulhampstead, Berkshire. The team also investigate the recent rise in the number of acid attacks across the country.