Crossing the Line is a book of great significance in South Africa today: it is an in-depth examination of police corruption and crime in the country, and hopes to remove the topic from academia and place it in the general public domain. The topic is, of course, highly relevant and corruption processes need to be understood by the man on the street because, after all, it affects all citizens.

The book includes a brief focus on three international policing agencies: The New South Wales Police Force, London's Metropolitan Police and the New York Police Departments Internal Affairs Bureau. It then moves on to the South African Police Service. Highlighted is the vast array of crimes committed by members of the SAPS – ranging from bribery and corruption to police brutality, robbery, rape and murder – and includes corrupt officers' symbiotic relationships with gangs and syndicates.