"A gang of police thugs."

"Renegades and perverted types."

These were just some of the ways in which the men and women of the Garda Special Branch were described by their enemies within the anti-Treaty IRA. What follows in this work is the gripping narrative of the often brutal and violent struggle for supremacy between these two sides.

It explores the foundation and the inner workings of a squad of detectives, initially called the Criminal Investigation Department (CID), based in Oriel House, Dublin, in August 1922 and their transition into what became known as the Special Branch. It further details the history of the turbulent decades which followed, and the regular confrontations with the IRA in which many officers of Ireland would make the ultimate sacrifice.