| Letícia Román | ... | Nora Davis | |
| John Saxon | ... | Dr. Marcello Bassi | |
| Valentina Cortese | ... | Laura Craven-Torrani | |
| Titti Tomaino | ... | Inspector | |
| Luigi Bonos | ... | Albergo Stelletta | |
| Milo Quesada | ... | De Vico / Paccini | |
| Robert Buchanan | ... | Dr. Alessi | |
| Marta Melocco | ... | Murder Victim | |
| Gustavo De Nardo | ... | Dr. Facchetti | |
| Lucia Modugno | ... | Nurse | |
| Giovanni Di Benedetto | ... | Professor Torrani (as Gianni De Benedetto) | |
| Franco Morici | ... | Policeman | |
| Virginia Doro | ... | Torrani's Maid | |
| Dante DiPaolo | ... | Andrea Landini (as Dante Di Paolo) | |
| rest of cast listed alphabetically: | |||
| Chana Coubert | ... | Ethel Windell Batocci (uncredited) | |
| Jim Dolen | ... | Priest (uncredited) | |
| Adriana Facchetti | ... | Woman in Sguattera restaurant (uncredited) | |
| Dafydd Havard | ... | Bit part (uncredited) | |
| Tiberio Murgia | ... | Bit part (uncredited) | |
| Peggy Nathan | ... | Bit part (uncredited) | |
| Lido Pini | ... | Bit part (uncredited) | |
| Franco Ressel | ... | Arresting Officer at airport (uncredited) | |
| John Stacy | ... | Bit part (uncredited) | |
Directed by | |||
| Mario Bava | |||
Writing credits(in alphabetical order) | ||
| Mario Bava | writer | |
| Enzo Corbucci | writer | |
| Ennio De Concini | writer | |
| Eliana De Sabata | writer | |
| Mino Guerrini | writer | |
| Franco Prosperi | writer | |
Produced by | |||
| Massimo De Rita | .... | producer | |
Original Music by | |||
| Les Baxter | (US version) | ||
| Roberto Nicolosi | |||
Cinematography by | |||
| Mario Bava | |||
Film Editing by | |||
| Mario Serandrei | |||
Art Direction by | |||
| Giorgio Giovannini | |||
Set Decoration by | |||
| Luigi D'Andria | |||
Costume Design by | |||
| Tina Grani | (as Tina Loriedo Grani) | ||
Makeup Department | |||
| Mara Rocchetti | .... | hair stylist | |
| Euclide Santoli | .... | makeup artist | |
Production Management | |||
| Paolo Mercuri | .... | production manager | |
Second Unit Director or Assistant Director | |||
| Enrico Checchi | .... | second assistant director | |
| Franco Prosperi | .... | assistant director | |
Art Department | |||
| Emilio Schuberth | .... | set dresser | |
Camera and Electrical Department | |||
| Ubaldo Terzano | .... | camera operator | |
Editorial Department | |||
| Lina Caterini | .... | assistant editor | |
Other crew | |||
| Armando Govoni | .... | production assistant | |
| Neda Matteucci | .... | script supervisor | |
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| L'uccello dalle piume di cristallo | Basic Instinct | La coda dello scorpione | Cosa avete fatto a Solange? | Sei donne per l'assassino |
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| Full cast and crew | Company credits | External reviews |
| IMDb Mystery section | IMDb Italy section | Add this title to MyMovies |
The American fan of mystery novels Nora Davis (Letícia Román) travels from New York to Rome to spend vacation with her mother's friend Ethel Windell Batocci (Chana Coubert). In the airplane, she accepts a pack of cigarettes from the passenger on the next seat and in the airport she finds that the man is a drug dealer. When she arrives at Ethel's place, she meets Dr. Marcello Bassi (john Saxon) and finds that the old lady is in the deathbed. During the night, Ethel has a heart attack and dies; Nora runs to the hospital to call Marcello. However, she is attacked and robbed in a staircase by a thief and faints; while awaking, she witnesses a stabbed woman and a man after her. In the hospital, nobody gives credit to her words. In the funeral, the stranger Laura Craven- Torrani (Valentina Cortese) introduces herself as a friend of Ethel and invites Nora to stay in her apartment while she travels to Switzerland to meet her husband. Nora accepts the invitation and decides to investigate the murder; she believes that the serial-killer of the so called Alphabet Murders is chasing her and she will be the next victim.
"The Girl Who Knew too Much" is an overrated melodramatic thriller of Mario Bava visibly inspired in Alfred Hitchcock. The awesome cinematography in black and white using shadows gives a fantastic atmosphere to the streets of Rome. However, the hysterical Nora Davis is annoying in many moments and the attitudes of Dr. Marcello Bassi are silly and naive. The conclusion of Dora about the cigarette of marijuana is ridiculous. My vote is five.
Title (Brazil): Not Available