Towards the back of McKee Barracks near Dublin’s Phoenix Park is the new headquarters of the Irish Military Intelligence Service (IMIS). It is surrounded by a new 4m-high fence and topped with a bank of antennas. The location is not meant to be a secret. A sign by the entrance reads Seirbhís Faisnéise Míleata na hÉireann above an image of two fish that are meant to represent the salmon of knowledge. But entry is strictly controlled. Even the secretary general of the Department of Defence has yet to be invited inside. For this reason, the IMIS officer meets The Irish...