谋杀发生在黑社会开会的时候。当灯亮起时，其中一人被发现背部被刺伤身亡，所有线索都指向一名身无分文的男子，他在谋杀前不久与受害者发生了争吵。
Tomas Milian
Nico Giraldi
Marina Ripa di Meana
Eleonora Ruffini
Roberta Manfredi
Angela Santi
Alberto Farnese
Manfredo Ruffini
Massimo Vanni
Brigadier Gargiulo
Enzo Liberti
Otello 'Er Pinna' Santi
Marino Masé
Enzo Nardelli
Angelo Pellegrino
Procurator Luciano Canuti
Enrico Luzi
Moretti
Renato Mori
Police Commissioner Galbiati
Leo Gavero
Judge Laurenzi
Bombolo
Venticello
Enzo Andronico
Defence Attorney Garrone
Andrea Aureli
Presiding Judge
