The investigations into a murder lead the Munich inspectors Ivo Batic (Miroslav Nemec) and Franz Leitmayr (Udo Wachtveitl) to Dannerberg in the foothills of the Alps. There the dead man worked as an auditor in a nunnery. However, the godly life seems tranquil only at first glance. Evidence quickly accumulates that the caretaker of the monastery is involved. But what is the motive? Were there any irregularities in the accounts that the auditor threatened to uncover? No less irritating are two envoys from Rome, who are conducting their own investigations in parallel with Batic and Leitmayr. Do the nuns want to cover up their own transgressions? And are there other wondrous secrets lurking behind the monastery walls?