When I was a young boy I viewed one filmed book from Agatha Christie on television with David Suchet. Now I would love to read that book but I forgot its name. I remember only few facts.
I remember the end of the film. There was a woman, an Irish woman. She and her followers were somewhere in the countryside in a castle. There was a politician of the British parliament as a prisoner. This group of people fought against Britain in many ways. At the end of this film the Irish woman stood on the roof of the castle and she said words such "erin cobra" (I remember it sounded something like that), then she put a pistol to her head and committed suicide and her body fell on the ground. The British politician was alive.
Which book was this episode based on?