Neither of them can function without the other – the investigator duo that is Thomas Bernhardt and Anna Habel returns for another round. Already a star of the Austrian National Theatre, actress Sophie Lechner had her sights set on bringing down the house in Berlin, but her last, dramatic act comes far too soon. The young woman is stabbed in her apartment by Berlin's Lietzensee, loud opera music resonating out from her apartment even hours after her murder. Whether they want to or not, Berlin detective inspector Thomas Bernhardt and Viennese chief inspector Anna Habel have no choice but to join forces once more. Did one of Sophie's numerous lovers commit a crime of passion, or had the eccentric actress made enemies in the thespian world? When other people who knew Sophie turn up dead, the two investigators find themselves hot under the collar despite the arctic temperatures in their snow-deluged cities.