Despite having written several books ridiculing marriage as an "old-fashioned superstition", Mortimer Brewster (Cary Grant) falls in love with Elaine Harper (Priscilla Lane), who grew up next door to him in Brooklyn, and, on Halloween day, they marry. Immediately after the wedding, Mortimer visits the eccentric but lovable relatives who raised him and who still live in his old family home: his elderly aunts Abby (Josephine Hull) and Martha (Jean Adair), and his brother Teddy (John Alexander), who believes he is Theodore Roosevelt. Each time Teddy goes upstairs, he yells "Charge!" and takes the stairs at a run, imitating Roosevelt's famous charge up San Juan Hill.