A body is found in a Leipzig canal. The chief inspectors Eva Saalfeld and Andreas Keppler manage to find out the identity of the man: it is Peter Schneider, a successful Leipzig entrepreneur and family man.

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Leitmayr's investigation of a Romanian pimp gets a fast conviction. Batic was not part of the investigation because he was a childhood friend of brothel operator Harry Schneider, for whom the victim supposedly worked. But the total indifference of the defendant irritated him. Back in the office, he asks again for the file of the convicted Romanian, because in all his years of service he had never experienced such a quick confession and not a single attempt to reduce his sentence.

The investigation into a murder case leads the Munich detectives Ivo Batic and Franz Leitmayr to Dannerberg in the foothills of the Alps. The deceased had most recently worked as an auditor in a nunnery there. However, the God-fearing life only seems tranquil at first glance. Evidence quickly mounts that the monastery's caretaker is involved in the crime. But what is the motive? Were there irregularities in the books that the auditor threatened to uncover? No less irritating are two envoys from Rome who are conducting their own investigations in parallel to Batic and Leitmayr. Are the nuns trying to cover up their own misdeeds? And are there other wondrous secrets lurking behind the monastery walls?