The Plot Thickens

Police Insp. Oscar Piper

Hildegarde Withers

Robert Wilkins

Alice Stevens

Kendall

Joe

John Carter

Marie

Jim

Dagmar

Robbins

Josephine, Hildegarde's Maid (uncredited)

Midget (uncredited)

Gas Station Attendant (uncredited)

Detective Fanning (uncredited)

Woman with Bag (uncredited)

Museum Guard in Egyptian Room (uncredited)

Man in Line for Inspection (uncredited)

Cassidy, a Policeman (uncredited)

Mr. Gordon, Museum Guard (uncredited)

First Hatless Suspect (uncredited)

Theresa the Cook (uncredited)

Man Threatening Carter (uncredited)