An account of the author's work for Michael Collins during the period from 1916 to 1921. From within the centre of the British security machine, Neligan fed information to Collins enabling the IRA to stay ahead of its enemies in intelligence matters at virtually all times throughout the conflict. Neligan was one of a number of Irish-born members of the detective branch operating for Collins over this period. The two others best known, Eamonn Ned Broy and James McNamara, also come into this narrative.