Leaping forward twenty years, the trilogy continues with the death of Fanny's husband, Panisse, and the discovery of her secret by her son, Césariot. The young man resolves to track down his biological father, Marius, whose life has been fraught with calamity and poverty.

"Merlusse" is French schoolboy slang for codfish, and M. Blanchard, a professor at a certain lycée, was known to his victims by that name. On Christmas Eve, when some twenty of the students—orphans, foreigners or just plain "unwanteds"—had to remain in the boarding school, Merlusse is placed in charge. His glass eye glares at them stonily, his good one with no less severity. He sets them to tasks, marches like a proctor up and down the aisles, exacts to the utmost the last measure of discipline. But when the youngsters awake in the morning, there are toys by each bed in the dormitory and M. Blanchard, no longer to be called Merlusse, is exposed for the softhearted fraud he is.