In an instant, some of the most senior members of the UK's intelligence services in Northern Ireland were killed in a helicopter crash on a remote hillside on the Mull of Kintyre, Scotland.
A weekend away for those leading the intelligence war in Northern Ireland turns to disaster when the Chinook helicopter they are travelling in goes down on the Mull of Kintyre.
In the wake of the crash, the RAF blames the pilots, leading to a 14-year campaign to clear their names.