Bertolucci, Bernardo	...	(Director)
Pier Paolo Pasolini, Pier Paolo Pasolini	...	(Writer)
Francesco Ruiu	...	Canticchia
Giancarlo De Rosa	...	Nino
Vincenzo Ciccora	...	Mayor
Alfredo Leggi	...	Bostelli
Gabriella Giorgelli	...	Esperia
Santina Lisio	...	Esperia's mother
Carlotta Barilli	...	Serenella
Ada Peragostini	...	Maria
Clorinda Celani	...	Soraya
Allen Midgette	...	Teodoro, the soldier
Renato Troiani	...	Natalino
Wanda Rocci	...	Prostitute
Marisa Solinas	...	Bruna
Alvaro D'Ercole	...	Francolicchio
Romano Labate	...	Pipito

Summary: Near the Tiber river, in a Roman park, a prostitute was killed. The police tracks down people that were inside the park during that night. They are questioned and have to explain why they were there. One of them is the killer.