 Details of a film examining Hitchcock 's obsession with Hedren were reported in December 2011 . The Girl , written by Gwyneth Hughes , would star Toby Jones as Hitchcock and Sienna Miller as Hedren . In a post @-@ production BBC press release about the film in November 2012 , Hughes described her enthusiasm when she was approached about the project while on holiday : " [ I ] got a phone call from producer Amanda Jenks . She only managed to get out the words ' Alfred Hitchcock and Tippi Hedren ' before I was already shouting ' yes yes yes ! ' to this seductive , sinister , deeply touching story of love and obsession among Hollywood royalty . " Hughes interviewed Hedren and members of Hitchcock 's crew before preparing a script . She described her discussions with Hedren : " Her wisdom and insights have helped me to put her real life ordeal on to the screen . I know Tippi is absolutely thrilled , as I am , with the casting of Sienna Miller to play her . " The film 's title was inspired by the name Hitchcock used for Hedren after she stopped working for him . 
