Entreated by the Belgian financier D'Aunay to investigate the gruesome and grimly theatrical death of actor Myron Alison, the Inspector Bencolin and his accomplice Jeff Marle find themselves at the imposing hilltop fortress Schloss Schadel, in which a killer lurks amongst a small group of suspects.

The sequel to "It Walks By Night" sees Henri Bencolin investigating the death of a magician in the wake of a mysterious burning man jumping from the battlements of a gothic castle on the Rhine. Also includes the Bencolin short 'The Fourth Suspect'.