Orso Maria Guerrini

Ettore Majorana

Luigi Pistilli

University assistant

Mariella Zanetti

Mariella

Loredana Savelli

Mariella's mother

Annalisa Fierro

Mariella's friend

Guido Alberti

S.E. Arturo Bocchini

Luigi Casellato

Inspector

Pietro Biondi

Enrico Fermi