J on Doyle’s debut novel tells the story of Mack O’Brien, a young man who went to a seminary to study for the priesthood but was asked to leave because he had no real calling, and has therefore returned to his family home in Wales to work out what to do with his life. Cheek by jowl with his ailing, deeply religious mother, and a father struggling to process the grief of his own parents’ recent deaths, he finds himself drawn into participating in a local theatre production – playing a disciple in Owen Sheers’s now-legendary Passion of Port Talbot, an immersive community-led re-enactment of the crucifixion that took place over several days in Port Talbot in 2012, starring Michael Sheen.…