A new sergeant arrives at Aidensfield police station, bringing plenty of radical ideas from his time in the city, much to the officers' disgust. When news gets out of his ambitious plans, which will leave Walker unemployed, Oscar decides to take a stand and rallies the troops.

Alf poses as a criminal as part of an undercover operation, but his covert actions only reveal startling information about Miller's ethical beliefs. David eyes up Peggy's room when she applies to be Lord Ashfordly's housekeeper but both are left disappointed when the interview is a complete failure.