The story opens upon Claude Lightfoot, a reckless 12 year old boy who constantly acts first and thinks later. After being in clash with some bullies, Claude is obliged to miss his First Communion. In the course of the story, Fr. Finn manages to cover a host of topics, including smoking, drinking, the devil, Confession, Holy Communion, retaining one s Baptismal innocence, the 9 First Fridays, the priesthood, mothers and sisters, truthfulness, lying, courage, effeminacy, atheism, sacrilege, baseball, Americanism (true and false), Latin, virtue, honor, leadership, etc.