Heartbeat (1992)

S15E02 The Devil You Know

Title: The Devil You Know Plot: As part of a secret mission, Alf takes on the role of a criminal, unintentionally uncovering shocking insights into Miller's moral values. Meanwhile, David shows interest in Peggy's room as she seeks the position of housekeeper for Lord Ashfordly, but both face disappointment when her interview turns out to be a total disaster.