1. Criminal Law: The crime of kidnapping refers to the act of kidnapping others or taking others hostage for the purpose of illegal possession by violence, threat, anesthesia or other means, or for the purpose of extorting property. In the movie, the kidnapper kidnapped a child, which may be related to kidnapping.
2. Criminal Procedure Law: In the movie, both the police and parents are looking for the missing child. According to the criminal procedure law of China, the police have the responsibility to conduct criminal investigations, including searching for missing persons. At the same time, parents can also seek the help of private detectives to find the missing children.
3. Civil Law: In the movie, the kidnappers physically hurt and psychologically abuse the kidnapped children. According to the civil law of China, no one may infringe upon the personal freedom and dignity of others. If the kidnappers are found guilty, they may face criminal and civil liabilities, including compensation for the victims' losses.
4. Child Protection Law: Events in movies may arouse public concern about child protection. In China, there is a special law to protect children, which stipulates the responsibilities of protecting, educating and raising children and punishes violations of children's rights and interests.
The above are some legal knowledge that may be involved in the movie "Lost Lamb". It should be noted that the above is only a brief introduction, and the specific situation needs to be judged by combining specific legal provisions and case facts.