Alfred Hitchcock wrote in 1982: "The Hitchcock touch had four hands, and two were Alma's." Hitchcock began work on his tenth film, "Blackmail" (1929), when its production company, British International Pictures (BIP), converted its Elstree studios to sound. The film was the first British ""; it followed the first American sound feature film, "The Jazz Singer" (1927). "Blackmail" began the Hitchcock tradition of using famous landmarks as a backdrop for suspense sequences, with the climax taking place on the dome of the British Museum. It also features one of his longest cameo appearances, which shows him being bothered by a small boy
Alfred Hitchcock start gathering, watching, and attacking. The question: "What do the birds want?" is left unanswered. Hitchcock made the film with equipment from the Revue Studio, which made "Alfred Hitchcock Presents". He said it was his most technically challenging film yet, using a combination of trained and mechanical birds against a backdrop of wild ones. Every shot was sketched in advance. An HBO/BBC television film, "The Girl" (2012), depicted Hedren's experiences on set; she said that Hitchcock became obsessed with her and sexually harassed her. He reportedly isolated her from the rest of the crew, had her followed, whispered obscenities to