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 |
| Writing | Jeremy Burnham | Writer |
| Writing | Augusto Caminito | Writer |
| Writing | Nestore Ungaro | Writer |
| Production | Bob Kellett | Associate Producer |
| Production | Nestore Ungaro | Producer |
| Sound | Tony Hatch | Music |
| Editing | Angelo Curi | Editor |
| Editing | Tony Lenny | Editor |
| Editing | Gunter Glinka | Editor |
| Production | Rebecca Howard | Casting |
| Costume & Make-Up | Franco Corridoni | Makeup Artist |
| Costume & Make-Up | Aldo Signoretti | Hairdresser |
| Production | Lucio Trentini | Production Supervisor |
| Directing | Antonio Gabrielli | Assistant Director |
| Art | Robert Conforte | Graphic Designer |
| Art | Gianni Giovagnoni | Assistant Art Director |
| Art | Armando Scarano | Property Master |
| Sound | Mario Dallimonti | Sound Mixer |
| Sound | Graham Harris | Sound Editor |
| Sound | Christopher Lancaster | Sound Editor |
| Sound | Mike Le Mare | Sound Editor |
| Sound | Peter Pennell | Sound Editor |
| Sound | John Poyner | Supervising Sound Editor |
| Sound | Decio Trani | Boom Operator |
| Sound | Bill Rowe | Sound Re-Recording Mixer |
| Crew | Germano Natali | Special Effects |
| Camera | Mario Bagnato | Camera Operator |
| Camera | Giulio Diamanti | Key Grip |
| Lighting | Marcello Gabriele | Gaffer |
| Camera | Daniele Nannuzzi | Camera Operator |
| Camera | Mario Tursi | Still Photographer |
| Costume & Make-Up | Bona Nasalli-Rocca | Wardrobe Supervisor |
| Costume & Make-Up | Angela Silighini | Seamstress |
| Production | Federico Tocci | Location Manager |
| Sound | Alan Willis | Music Editor |
| Directing | Marion Mertes | Continuity |
| Production | Eleanor Kearney | Production Coordinator |
| Crew | Abe Mandell | Creative Consultant |
| Production | Robert Mandell | Production Coordinator |
| Production | Adrian McCarthy | Production Assistant |
| Production | Gérald Morin | Production Assistant |
| Camera | Armando Nannuzzi | Director of Photography |
