My Traitor tells the story of Antoine, an idealistic young French violin-maker, who takes a train from Dublin to Belfast in 1977 and is propelled into the heart of the Falls Road and the Republican movement, and Ireland's music, suffering and beauty.

He meets Tyrone Meehan, a charismatic, high-ranking member of the IRA, who becomes his friend and mentor, and a symbol of the Irish struggle. Over the next three decades, from the streets of Belfast to the fields of Donegal, he witnesses the marches, the hunger strikes, the peace process, learning about bombs, prison, poverty and pride.