Police inspector Matteo Rolandi (Claudio Cassinelli, The Suspicious Death Of A Minor) witnesses a massacre in a hotel when a bomb explodes and kills dozens of civilians. The prime suspect, a young political activist (Bruno Zanin, Amarcord), is shot dead soon after, despite being under the protection of General Attorney Di Federico (Arthur Kennedy, The Man From Laramie). As Inspector Rolandi continues his investigation, he soon discovers a terrifying conspiracy behind the act of brutal terrorism. Based on the notorious 1969 Piazza Fontana bombing, Killer Cop is a gritty poliziottesco from giallo master Luciano Ercoli (The Forbidden Photos Of A Lady Above Suspicion).