J.B. Ball (Edward Arnold (actor)), the third richest banker in America, becomes infuriated after learning that his wife Jenny (Mary Nash) bought a $58,000 sable fur coat without his knowledge. After finding many fur coats in her closet, Ball grabs one which turns out to be, in fact, the offending coat and throws it off his New York City penthouse apartment roof. It lands on Mary Smith (Jean Arthur) while she is riding to work on a double-decker bus. When she tries to return it, he tells her to keep it (without informing her how valuable it is). He also buys her an expensive new hat to replace the one damaged in the incident, causing her to be mistaken for his Mistress (lover). When she shows up for work, her straitlaced boss suspects her of behaving improperly to get a coat she obviously cannot afford and fires her to protect the reputation of the ''Boy's Constant Companion'', the magazine he publishes.