Onora il padre (2001)

Matteo Colonna is a police inspector and he has to investigate a murder in Rimini, the town he was born in. Matteo finds out that the murder is the last of a long series started more than twenty years before. At last Matteo and his two colleagues Fernandez and De Angelis identify the serial-killer. It is a meek teacher. The case seems to be solved, but Matteo has still some doubt.