Vienna 1384. The convent cook Johanna has had the wine she urgently needs for her vinegar drunk away. Her frustration worsens when her superior insists on giving her lessons in piety. How inappropriate that the very monk who is supposed to teach her lies dead in the kitchen! However, the assassination attempt on the ducal family is the last straw - Hannerl is sentenced to death as a poisoner! The only thing that can help now is a miracle, of which, thankfully, there are plenty in Vienna.