 Paul LukasPhilo Vance | Philo Vance |
 Alison SkipworthPriscilla Kinkaid Llewellyn | Priscilla Kinkaid Llewellyn |
 Donald CookLynn Llewellyn | Lynn Llewellyn |
 Rosalind RussellDoris Reed | Doris Reed |
 Arthur ByronRichard Kinkaid | Richard Kinkaid |
 Ted HealyPolice Sergeant Ernest Heath | Police Sergeant Ernest Heath |
 Eric BloreCurrie | Currie |
 Isabel JewellAmelia Llewellyn | Amelia Llewellyn |
 Louise FazendaBecky | Becky |
 Purnell PrattDistrict Attorney John Markham (as Purnell B. Pratt) | District Attorney John Markham (as Purnell B. Pratt) |
 Leslie FentonDr. Kane | Dr. Kane |
 Louise HenryVirginia Llewellyn | Virginia Llewellyn |
 Leo G. CarrollSmith (as Leo Carroll) | Smith (as Leo Carroll) |
 Charles SellonDr. Doremus | Dr. Doremus |
 Ernie AdamsHusband of Fat Lady at Auction (uncredited) | Husband of Fat Lady at Auction (uncredited) |
 Brooks BenedictCasino Patron (uncredited) | Casino Patron (uncredited) |
| EEdna BennettNurse to Lynn (uncredited) | Nurse to Lynn (uncredited) |
 Sidney BraceyWaiter (unconfirmed) (uncredited) | Waiter (unconfirmed) (uncredited) |
 Wallis ClarkDr. Elton (uncredited) | Dr. Elton (uncredited) |
 William DemarestAuctioneer (uncredited) | Auctioneer (uncredited) |
 Jay EatonAuction Floorman (uncredited) | Auction Floorman (uncredited) |
 Lillian ElliottMrs. Marting (uncredited) | Mrs. Marting (uncredited) |
 Pat FlahertyWatchman (uncredited) | Watchman (uncredited) |
| EEddie HartPolice Detective (unconfirmed) (uncredited) | Police Detective (unconfirmed) (uncredited) |
 Grace HayleFat Lady at Auction (uncredited) | Fat Lady at Auction (uncredited) |
| TTom HerbertReporter (uncredited) | Reporter (uncredited) |
 Milton KibbeeReporter (uncredited) | Reporter (uncredited) |
 Keye LukeTaki - Casino Pageboy (uncredited) | Taki - Casino Pageboy (uncredited) |
 Alphonse MartellRoulette Croupier (uncredited) | Roulette Croupier (uncredited) |
 Bert MoorhouseCasino Patron (uncredited) | Casino Patron (uncredited) |
