Robert Shannon is a Catholic Irish boy. He is orphaned and has to go and live with his mother’s family in Scotland. There, the majority are Presbyterians, and they show a certain degree of rejection.

The novel is structured in three parts: when Robert is 8, 15 and 18 years old. The author masterfully portrays the protagonist’s psychology at each of these ages. He is somewhat shy, eager to become a great scientist, and has a deep sense of religion. The author has him speak in the first person, and his character is reflected in the dialogues and in his thoughts.

The different characters are very well drawn. Above all, the peculiar, noble and humane personality of his roguish great-grandfather, who helps and understands him so much at every stage. He helps him overcome the narrow-mindedness of his new father… and fulfil his duties as a Catholic, despite belonging to another denomination.

His relationship with Gavin is very instructive, as they maintain a sincere and genuine youthful friendship. Other deeply human characters also appear, such as his siblings Murdoch and Kate; Jamie, a factory worker; his teacher; the young Alison… each with their hopes, projects and personal struggles.

Everything unfolds in the traditional, close-knit atmosphere of a small Scottish village. The religious theme runs throughout the novel and is treated with respect and insight.