The Affairs of Martha, also known as Once Upon a Thursday, is a 1942 American romantic comedy film directed by Jules Dassin and written by Isobel Lennart based on her story.

The peace and quiet enjoyed by the residents of the exclusive neighborhood of Rock Bay, Long Island is disturbed by a newspaper gossip column tidbit that one of their maids is writing a tell-all book about her employers.

Their longtime cook Mrs. McKessic arranges a meeting of the neighborhood servants, in which they decide to band together against the attempts by many of their employers to spy on them to learn who the writer is.

When the Sommerfields' son, Jeff, returns unexpectedly after a year and a half away studying the Eskimos, he introduces the family to his new fiancée, mathematician Sylvia Norwood.

Finally, Archer crashes the Sommerfields' dinner party, and is provoked by the guests' harsh comments into stating first that he will be publishing the book and then that Martha is the author.