Joan Harrison (screenwriter) the film "Jamaica Inn" (1939) based on the novel by Daphne du Maurier. When Hitchcock moved to Hollywood in March 1939 to begin his contract with David O. Selznick to direct films, Harrison went with him as an assistant and writer. She continued contributing to the screenplays for Hitchcock's films "Rebecca" (1940), also adapted from a du Maurier novel, "Foreign Correspondent" (1940), "Suspicion" (1941), and "Saboteur" (1942). She was also credited as one of the screenwriters for "Dark Waters" (1944). Harrison was an uncredited screenwriter for "Ride the Pink Horse" (1947) and "Your Witness" (1950). She became a film producer
Daphne du Maurier time". In later life, she wrote non-fiction, including several biographies such as "Gerald", her father's biography. "The Glass-Blowers" traces her French Huguenot ancestry and vividly depicts the French Revolution. "The du Mauriers" traces the family's move from France to England in the 19th century. "The House on the Strand" (1969) combines elements of "mental time-travel", a tragic love affair in 14th-century Cornwall, and the dangers of using mind-altering drugs. Her final novel, "Rule Britannia" (1972), satirises resentment of British people in general and Cornish people in particular at the increasing U.S. dominance of Britain's affairs. Du Maurier wrote three plays.