No wonder Katherine Ellis (a. k. a. Kit) is worried. She comes to stay with her Aunt Sophia, her only living relation, thinking that her aunt is wealthy. When Aunt Sophia says she is broke, Kit must take a job as a waitress. Then Aunt Sophia has her shifty friend Stuart Baxley accuse Kit of stealing a hundred-dollar bill from the hatbox Aunt Sophia keeps in her closet. But Kit, who helps with the housekeeping, knows the closet once contained dozens of hatboxes and that the others have all disappeared. Enter Perry Mason, Los Angeles's most famous lawyer, who knows a person in distress when he sees one. He offers to help Kit. Just in time, it turns out, because someone has assaulted Aunt Sophia, and the police have only one suspect--Kit. Join the incomparable Perry Mason and his talented associates--secretary Della Street, private investigator Paul Drake--as they untangle The Case of the Worried Waitress.