Belfer suspects that Kacper was the Captain's son. The tailor and Drużbacki find traces of blood in the warehouses. One of the employees confesses to the murder.
A recording appears on the Internet which shows that Kacper most likely committed suicide. Meanwhile, the newspaper publishes an article accusing the Captain of violence against students.
The police determine the identity of the boy found on the beach. The investigation is led by Assistant Commissioner Ewa Krawiec. The teacher begins to suspect that the Captain is hiding something from him.
During a cruise for high school graduates organized by Belfr and his father, called the Captain, one of the students, Kacper Krynicki, disappears. Shortly afterwards, the police find the boy's body on the beach.