Hotel employee Marion Faust was violently thrown from the balcony at home. Ballauf and Schenk find out that shortly before her death she had left several concerned messages on Susanne Baumann's answering machine. But the employee of the internationally renowned architects Könecke & Partner is currently untraceable. Could her husband Lars Baumann have something to do with it? As site manager, he should have been back in Qatar long ago, where Könecke & Partner is building for the 2022 World Cup. He is also said to be urgently looking for his wife. And apparently there had recently been a loud argument between him and Marion Faust at the hotel reception. But when the commissioners want to interrogate him at the headquarters, he goes into hiding.