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.

Norman is going through a hard time and meets his long-lost friend, Daniel, to ask him for help. When Anna, a pretty journalist, enters the bar, Daniel sees her as the perfect opportunity for Norman to once again start believing in himself.

A young agent leaves everything behind to pose as a member of ETA, risking her life to uncover the terrorists' hideouts in the south of France.