Synopsis for
Uccello dalle piume di cristallo, L' (1970)

Sam Dalmas (Tony Musante) is an American writer currently living in Rome with his model girlfriend Julia (Suzy Kendall). On the night before they are about to return to the US, Sam witnesses the attack of a woman (Eva Renzi) by a mysterious black-gloved assailant dressed in a raincoat. Attempting to reach her, Sam is trapped between two mechanically-operated glass doors and can only watch as the villain makes his escape. The woman, Monica Ranieri, the wife of the gallerys owner, survives the attack, but the local police confiscate Sams passport to stop him leaving the country, because they believe him to be an important witness. Sam is haunted by what he saw that night, feeling sure that some vital clue is evading him, and soon finds that both he and his girlfriend are the killers new targets. In an exciting conclusion, Sam chases the mysterious assailant through a darkened building. He is trapped once more, this time pinned to the floor by release of a wall-sized sculpture of wire and metal. Unable to free himself, he becomes the prey of the person he was pursuing -- the attractive, deranged wife of the gallery owner. This climax to the mystery, with strong sado-masochistic elements, has the knife-wielding lady teasing Sam in preparation to stabbing him. She fails, of course, and Sam provides the obligatory wrap-up scene with his girlfriend