Murder on the Blackboard (1934)

A young music teacher is murdered in her classroom late at night. Hildegard Withers (Edna Mae Oliver) discovers the body and calls in her old friend, Inspector Piper. (She was supposed to have married Piper as the first movie in this series ended, but evidently Hollywood called it off.) Piper sets off to solve the crime, but Hildegard does her own sleuthing. Clues fly left and right, with Hildy, as always, a step ahead of Piper. The teacher has left some mysterious notes on a staff on the blackboard, and Hildegard puzzles over those until she unlocks the crime.


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