Legacy of the Easter Rising

The book begins with a survey of the hatred beween England and Ireland, dating back to the time of Queen Elizabeth, and then is followed by references to the Irish potato famine. American President Wilson was against Ireland in the Rising, even leaking information to the British.
This book reports on the turmoil of the 1916 Easter Rising in Dublin and focuses on an English killer, Major Browne, and an Irish soldier, Jerry Murphy. They encounter one another in Dingle again where the Englishman murders the Irish rebel and sets in motion a trail of revenge with the Irishman's younger brother Bart killing Major Browne.
After learning of his brother's death, Percival Browne begins his pursuit of Bart Murphy who has become a teaching Christian Brother. Murphy feels guilt over the shooting of the Englishman, and this follows him all his life.
Murphy's superiors assign him to a school in New York with Browne still hunting him and taking a shot at him while he's on vacation. An Irish nurse cares for Murphy and is also attacked by Browne. Another brother wounds Browne. When the killer learns that Brother Murphy will go on a sabbatical to Dingle, he plans on shooting him there.
An FBI agent with an Irish background gets interested in the case and travels to Ireland to safeguard Murphy.