What is the theme in Reading in the Dark by Seamus Deane?

The main theme of the novel, which manifests itself in various forms, can be regarded as betrayal. McIlhenny first betrayed the confidences of his IRA associates when he informed on them to the police, while the police in their turn betrayed Uncle Eddie when they set him up to be discovered as an informer by the boy's grandfather. These initial incidents were directly or indirectly linked to a series of events and consequences in which betrayal and disloyalty of various forms characterize the history of the boy's family over time and ultimately his own experiences.