Caught between the truth and a murderer's hand!

A newsman works with a blind puzzle-solver to uncover a deadly conspiracy linked to a genetic research facility.

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Main Cast: James Franciscus, Karl Malden, Catherine Spaak, Pier Paolo Capponi, Horst Frank, Rada Rassimov, Aldo Reggiani, Carlo Alighiero, Vittorio Congia, Ugo Fangareggi

Director: Dario Argento

Writers: Dario Argento, Dardano Sacchetti, Bryan Edgar Wallace, Luigi Cozzi

Editor: Franco Fraticelli

Cinematographer: Erico Menczer

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