Rick Blaine (Humphrey Bogart), who owns a nightclub in Casablanca, discovers his old flame Ilsa (Ingrid Bergman) is in town with her husband, Victor Laszlo (Paul Henreid). Laszlo is a famed rebel, and with Germans on his tail, Ilsa knows Rick can help them get out of the country.

When a reporter is assigned to decipher newspaper magnate Charles Foster Kane's (Orson Welles) dying words, his investigation gradually reveals the fascinating portrait of a complex man who rose from obscurity to staggering heights. Though Kane's friend and colleague Jedediah Leland (Joseph Cotten), and his mistress, Susan Alexander (Dorothy Comingore), shed fragments of light on Kane's life, the reporter fears he may never penetrate the mystery of the elusive man's final word, "Rosebud."

Returning home from a shopping trip to a nearby town, bored suburban housewife Laura Jesson (Celia Johnson) is thrown by happenstance into an acquaintance with virtuous doctor Alec Harvey (Trevor Howard). Their casual friendship soon develops during their weekly visits into something more emotionally fulfilling than either expected, and they must wrestle with the potential havoc their deepening relationship would have on their lives and the lives of those they love.