Borowski und der Wiedergänger.

The notoriously unfaithful Tobias Exner has been cheating on his wife Greta, from whose money he lives, for a long time. With his anonymous acquaintance "Kitty13", whom he met on a dating portal, Tobias plans to murder his wife in order to be rich and free. He already has a plan to make her disappear. But before Tobias Exner can implement his plan, he himself disappears without a trace. All lines of investigation lead Klaus Borowski and Mila Sahin to the mysterious dating contact.