Dirección: Roy William Neill
Sherlock Holmes debe custodiar la Estrella de Rodesia, un valioso diamante que pertenece a Lady Carstairs. Roland, el hijo de la dama, teme que durante el viaje en tren de Londres a Edimburgo pueda ocurrirle algo a la cotizada joya. Y sus temores se cumplen: Roland es asesinado en el tren y el diamante desaparece. Es entonces cuando interviene Holmes, que con la ayuda de Watson y del inspector Lestrade, intenta recuperar la joya.
Basil Rathbone
Sherlock Holmes
Nigel Bruce
Dr. John H. Watson
Alan Mowbray
Major Duncan-Bleek
Dennis Hoey
Inspector Lestrade
Renee Godfrey
Vivian Vedder
Frederick Worlock
Prof. William Kilbane
Mary Forbes
Lady Margaret Carstairs
Skelton Knaggs
Sands - Moran's Accomplice
Billy Bevan
Conductor Taking Tickets
Geoffrey Steele
Roland Carstairs
Janet Murdoch
Mrs. Shallcross (uncredited)
Gerald Hamer
Alf Shallcross (uncredited)
Leyland Hodgson
Senior Conductor (uncredited)
Harry Cording
Mock the Undertaker (uncredited)
Charles Knight
Baggage Car Guard (uncredited)
Boyd Davis
"Inspector MacDonald" (uncredited)
Bobby Wissler
Mock Jr. (uncredited)
Gilbert Allen
Dining Car Steward (uncredited)
C. Aubrey Smith
Elderly gentleman on train station (uncredited)
