Knock knock police informs about murdered son

A 4-year-old boy is investigated by the police about his father's death.

A man whose son has been murdered pushes to create laws to financially protect victims' families.

During an inquest after a woman is killed, the judge suspects his own son. The woman's lover had been friendly with the son and he was also supposed to be married to the judge's daughter.

Brad has committed murder and barricaded himself inside his house. With the help of his friends and neighbours, the cops piece together the strange tale of how this nice young man arrived at such a dark place.

A father killed his son. In a state of alcoholic delirium, a young man murdered his friend. A 21 year-old boy shot a policeman. Faced with their death sentence, they tell about what happens with them at the moment when they are between death and ... death.

A mother experiences the torment of discovering that her own son is a killer.

Keiichi Yoshinaga, who works for a major construction company receives a sudden phone call from his ex-wife, Junko Aoba. She tells Keiichi that their second son, Tsubasa, who lives apart, has been arrested for murdering his classmate. Keiichi immediately meets Tsubasa, but for some reason he keeps silence. Since Tsubasa shows no signs of reflecting upon his conduct, he is possibly going to an open trial. To overcome this situation, Keiichi consults a lawyer Kyoko Kanzaki who has a child of the same age.

A psychological detective story about a police hunt for the murderer of young boys. The police comissioner ends up tracing the clues to his own home, where he has an adolescent son he has not been able to communicate with.

A chief police inspector investigates the disappearance of a 25-year-old woman, the daughter of a lonely widower. After she turns up dead, the cops race to find the killers before the grieving father does

After the murder of his police officer son in the line of duty, a father, himself a veteran police detective, must choose between following the law and seeking vengeance.