Peter Tremaine (Corn. Tremaine) is the pseudonym of an English writer, famous Celtic scientist, member of the organizing committee of the International Celtic Congress Peter Ellis. Tremayne is called the creator of the “Celtic thriller” - a series of novels about the insightful Irish nun, Sister Fidelma of Kildare... Strenescalc Monastery in Northumbria, year 644 AD. The synod gathered here will have to decide which church tradition the Angles and Saxons will follow - Roman or Irish. Passions are running high, everyone is waiting for what the beautiful and learned abbess Etain will say. Her sudden and terrible death threatens to turn into turmoil for the country: both sides blame each other for this monstrous murder. By the will of King Oswiu and Hilda, the abbess of the monastery, Fidelma and the Saxon monk Eadulf have to find and expose the criminal.