The famous forensic phonetician Matthias Hegel is a luminary in his field. Even the slightest deviation in the sound of a voice is enough for him to distinguish truth from lies and thus convict criminals. But now the police consultant confesses to having committed a gruesome murder.

Janina Fautz
as Jula Ansorge

Juergen Maurer
as Matthias Hegel

Nico Kleemann
as Friedrich von Würzburg

Adrian Maaß
as Elyas Ansorge

Tanja de Wendt
as Obdachlose

Inga Dietrich
as Michaela Proehl

Peter Miklusz
as Heiko

Martin Ontrop
as Tuchmann

Eneko Sanz
as Polizist

Emanuela von Frankenberg
as Petra Kramer