Young Linda Channing (Jennie Linden) visits her fiancé Ian Faulkner (Michael Medwin) at an old aristocratic residence near London. Here he witnesses several mysterious murders. There are no clues to these murders – only bloody corpses and the terrifying sound that always comes shortly before the murders. Inspector Mark Santini (Slobodan Dimitrijevic) embarks on the investigation and slowly unfolds a story full of old wrongs and terrifying revelations…