Johnston Brown was born in Holywood,County Down,in Northern Ireland in April 1950. He is the sixth born of twelve children. He has eight sisters and three brothers. He was educated at Holywood Primrary and Holywood Secondary Schools.
In and out of Welfare Care homes and short term foster homes due to his warring parents he believes his turbulent childhood prepared him well mentally for all those very traumatic events that he later encountered as an active detective in Belfast at the height of the "troubles".He was a qualified electrician for years with Rotary Electric in Belfast,before he left the trade to join the Royal Ulster Constabulary (RUC) on 30th January 1972 (Bloody Sunday)at the age of 21 years.
Johnston served for the obligatory two year Probationary period in uniform at Newtownabbey RUC Station before he was drafted into the RUC Criminal Investigation Department (CID) on the 20th May 1974. He served in the CID in Belfast for just under 30 years in some of the most notorious hot spots such as West Belfast and the "Killing Fields" of North Belfast. He uses his experiences to afford the reader a fascinating insight into the sordid and murky world of informant and agent handling and misconduct by the few. His debut book "Into the Dark" was a local phenomenon and best seller. He is currently working on follow up books that will equally enthrall the reader.