A new school day, a new case. When Emma learns about a possible extortion, she immediately takes off for school to check in with her fellow detectives!

Max and Nina team up to try to figure out why their schoolmate Madeleine is being blackmailed, but the evidence has disappeared.

Madeleine continues to be blackmailed, but Nina, Emma, and Max are on the case. Meanwhile, Matteo leaves the house and runs right into the main suspect.

When Nina finds out that her brother Matteo has disappeared, she and her detective friends form a search party.

Matteo is found relatively quickly, but it causes Max, Nina, and Emma to miss an appearance of the culprit. When photos of Madeleine are posted on the internet, it's time to take action. Luckily, the young detectives know who might have the information they need.

With the help of Matteo, our schoolyard detectives are happy to have finally found the culprit and gotten the authorities involved. Only Max is left disappointed when he finds out why Nina won't go out with him.