Batic - 69 - Das verkaufte Lächeln

The body of 14-year-old Tim Kiener is found at the Isar weir. The boy was shot at close range. There is no apparent motive for the crime. Tim had neither problems with his parents nor with his classmates. When he wasn't out with his friends Hanna and Florian, he sat at his computer and allegedly developed apps and websites to supplement his pocket money. As investigators examine Tim's computer, they discover something they never thought possible: the boy has been offering revealing pictures and videos of himself to a growing clientele through his own paid website. He's chatted with adult customers, stripped naked on webcam, and gotten paid for it through gift lists.
So is one of his website customers Tim's killer? The traceson the net, the Munich chief inspectors Batic and Leitmayr lead to a family man who trains young soccer players in his free time. But Guido Buchholtz seems to have an alibi. Inspector Kalli Hammermann's background investigations into Tim's clientele don't lead any further either. While Batic is ironically concentrating on proving that Buchholtz was actually at the scene of the crime, Christine Lerch, head of the operational case analysis, doubts whether Buchholtz was the perpetrator. Leitmayr, on the other hand, wonders who is actually the perpetrator and who is the victim in online transactions. Meanwhile, Tim's parents are stunned by the facts. They find that their boy has been doing things online that they had no idea about.
Tim's friends Hanna and Flo, on the other hand, seem to be familiar with it.