As Belfast sinks deeper into the hands of rioters, an alienated young man receives devastating news. In his refusal to accept death, Robin begins to scour the city for his missing companion. Whilst friends, Grace and Eoin, struggle to comprehend his actions, tensions throughout the city bubble. All the while a mysterious visitor begins his own journey to watch the decay of the world around him, trumpet in hand...

In a post-catastrophe world, where the inhabitants of the re-established cities treat outsiders with suspicion and hostility, Isaac encounters a stranger - who seems to have a way for him to cross the border.