In the eighth volume of the bestselling series, the Kaminski kids meet Sven during a visit to the youth center. Simon's best friend Loko is particularly fascinated by Sven. When Sven offers Loko an Ecstasy pill, he surprisingly accepts, much to the kids' dismay. One day, Loko takes an Ecstasy bag from Sven to sell, but he gets into trouble when the police conduct a raid at the youth center. Simon has the chance to discreetly remove the bag from the house. Under extreme time pressure, he decides to do so. Although he has serious reservations, he believes it is more important to support his best friend in need. To dispose of the drugs safely, Debora, Raffi, and Simon decide to destroy the pills. However, this puts Loko in new trouble, as Sven demands either the money back or the drugs. When Sven finds out who destroyed the pills, the kids find themselves dangerously caught in the middle of the situation. With their combined efforts, they manage to give Sven an unwelcome surprise from the police in the city park during an exciting showdown.