Dr. Anselm Rees, a psychologist
Dr. Lidia Rees, his daughter
Floyd Stenhouse, a musician (Patient A)
Della Cookson, an actress (Patient B)
Claude Weaver, a writer (Patient C)
Benjamin Teasel, an impresario
Lucy Levy, an actress
Marcus Bowman, a financier and playboy
Tweedy, a publisher
Pete Hobbs, an elevator boy
Olive Turner, a housekeeper
Assorted maids, clerks and supernumeraries
George Flint, a police inspector
Jerome Hook, a police sergeant
Joseph Spector, a professional trickster