Alfred Hitchcock and Joan Fontaine made two movies together, "Rebecca" (1940) and "Suspicion" (1941). In 1942, Hitch wanted to work with Joan again on a new project called "Shadow of a Doubt", but Joan was unavailable. Eventually Hitch settled for Teresa Wright instead. "Shadow of a Doubt", which also starred Joseph Cotten, was released in 1943 and was to be Hitchcock's personal favourite.
Production on "Shadow of a Doubt" began in April 1942, with the actual shooting starting in August. On 8 June 1942, Alfred Hitchcock sent a telegram to Joan Fontaine, asking her to be part of his new film. "S", whom Hitch refers to in his telegram, is presumably Jack Skirball, the film's producer.
VIA WESTERN UNION- STRAIGHT WIRE
June 8, 1942
THE CAMPBELL HOUSE
PEBBLE BEACH, CALIF.
DEAR JOAN DO YOU WANT TO PLAY THE LEAD IN MY NEXT CONFIDENTIALLY BECAUSE S DOES NOT KNOW [redacted] I'VE TELEGRAPHED YOU LOVE
Charge to: [redacted] Jack Skirball Productions