Murder on the Blackboard
There are plenty of guilty secrets at the school where Hildegarde Withers teaches. When she finds the body of the pretty music teacher, she calls in her old friend Inspector Piper, who promptly arrests the obvious suspect. Clues multiply and everyone looks suspicious as Piper and Miss Withers continue their battle of the sexes.
Edna May Oliver
Hildegarde Withers
James Gleason
Police Insp. Oscar Piper
Bruce Cabot
Stevens
Gertrude Michael
Jane Davis
Regis Toomey
Detective Smiley North
Edgar Kennedy
Detective Donahue
Tully Marshall
MacFarland
Jackie Searl
Leland
Frederick Vogeding
Otto (as Fredrik Vogeding)
Barbara Fritchie
Louise
Gustav von Seyffertitz
Dr. Von Immen
Tom Herbert
Detective McTeague
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