Barbara Carey flies to Italy to visit her blind sister Mary Ann, who is studying in a music academy. Once in Rome Barbara discovers her sister has disappeared and, according to the Italian police, she may have been murdered by a maniac who is obsessed with young sightless women. With the help of Martin Foster, from the British Embassy, Barbara starts trying to find out what happened to Mary Ann. She even pretends to be blind herself in an attempt to attract the killer, and finally the clues lead her to Seagull Island, privately owned by a mysterious British citizen named David Malcolm. Barbara must then find the answers to several questions: was Mary Ann really kidnapped? What happened to David's wife and son in the island? And why is David's relative Carol so unhappy to see a woman with him?
| Directing | Nestore Ungaro | Director |
| Art | Giuseppe Mangano | Art Direction |
| Costume & Make-Up | Bona Nasalli-Rocca | Wardrobe Supervisor |
| Editing | Gunter Glinka | Editor |
| Sound | Peter Pennell | Sound Editor |
| Sound | John Poyner | Supervising Sound Editor |
| Writing | Nestore Ungaro | Writer |
| Costume & Make-Up | Aldo Signoretti | Hairdresser |
| Costume & Make-Up | Angela Silighini | Seamstress |
| Production | Federico Tocci | Location Manager |
| Production | Eleanor Kearney | Production Coordinator |
| Production | Gérald Morin | Production Assistant |
| Art | Armando Scarano | Property Master |
| Camera | Daniele Nannuzzi | Camera Operator |
| Camera | Mario Tursi | Still Photographer |
| Production | Adrian McCarthy | Production Assistant |
| Costume & Make-Up | Franco Corridoni | Makeup Artist |
| Sound | Mario Dallimonti | Sound Mixer |
| Camera | Mario Bagnato | Camera Operator |
| Production | Bob Kellett | Associate Producer |
| Sound | Tony Hatch | Music |
| Sound | Mike Le Mare | Sound Editor |
| Camera | Giulio Diamanti | Key Grip |
| Production | Lucio Trentini | Production Supervisor |
| Art | Robert Conforte | Graphic Designer |
| Sound | Alan Willis | Music Editor |
| Production | Robert Mandell | Production Coordinator |
| Sound | Graham Harris | Sound Editor |
| Sound | Bill Rowe | Sound Re-Recording Mixer |
| Crew | Germano Natali | Special Effects |
| Production | Rebecca Howard | Casting |
| Sound | Christopher Lancaster | Sound Editor |
| Crew | Abe Mandell | Creative Consultant |
| Writing | Jeremy Burnham | Writer |
| Writing | Augusto Caminito | Writer |
| Editing | Tony Lenny | Editor |
| Directing | Antonio Gabrielli | Assistant Director |
| Sound | Decio Trani | Boom Operator |
| Lighting | Marcello Gabriele | Gaffer |
| Editing | Angelo Curi | Editor |
| Art | Gianni Giovagnoni | Assistant Art Director |
| Directing | Marion Mertes | Continuity |
| Production | Nestore Ungaro | Producer |
| Camera | Armando Nannuzzi | Director of Photography |
