In 2007, after almost 40 years of operations, the SAS ceased operations in Northern Ireland and ended the longest operational commitment in the unit's history. It had been a brutal and ruthless conflict on both sides with the SAS famously describing its attitude to the use of lethal force as 'Big Boys' Rules'. Anyone suspect caught with a gun or bomb could expect to be shot without question.

Starting in 1969, Mark Urban reveals the extraordinary history of the special forces' operations in Northern Ireland and the unenviable dilemmas faced by intelligence chiefs engaged in a daily struggle against one of the world's most sophisticated terrorist organisations.

'This is a book that needed to be written and which fulfils the essentials of any Ulster story; it expands understanding beyond fragmented jingoism and newspaper headlines.' Sunday Times