The Missing Boy

After school, five junior high school students in London Middle School disappeared collectively. Also disappearing was the mother of one of the students. That night, the female criminal police captain received a report and based on clues, initially determined that this was a collective kidnapping case, and the missing single mother Leng Chunlai was suspected of being involved in the case. It's just that her entire action was too blatant and her motives were a mystery. After all, what mother would kidnap her own child?
Immediately afterwards, four families received blackmail messages one after another: If they want a child, they must pay 2 million pounds!