When the landlord of a local pub is found stabbed in the back, Inspector Witherspoon tries to fathom the mystery from first principles. Meanwhile Mrs Jeffries and the household staff spring into action, trying to make sure that the right person is apprehended. This charming series of Victorian murder mysteries features mild-mannered Inspector Witherspoon of Scotland Yard and, more importantly, Mrs Jeffries, his housekeeper. A policeman's widow herself, her quick wits allow her to nudge the Inspector in the right direction to solve the crime.