Postmark for Danger (1955).

Terry Moore, ca. 1956

In Postmark for Danger (based on Portrait of Alison by Francis Durbridge), an artist (Robert Beatty) learns that a car crash in Italy has killed his journalist brother and an actress (Terry Moore). A Scotland Yard inspector (Geoffrey Keen) is interested in a mysterious postcard sent by the journalist before his death; complications ensue with further deaths, including that of the artist's model (Josephine Griffin).