Ex-CIA agent Jack Ryan is forced back into service when he saves the lives of the English minister to Northern Ireland and his family from a terrorist attack, killing one of the perpetrators in the process. The dead man's brother, also a member of an IRA splinter faction, vows revenge on Ryan and his family and pursues them to the United States. Ryan knows it is only a matter of time till he comes face to face with his nemesis... and that only one of them will come out alive.