When a teenage pyromaniac terrorizes a neighborhood, the police are helpless as frightened victims refuse to testify against him. Enter Hetty, posing as the Irish sister-in-law of one of the residents. Her plan: infiltrate the local sewing circle and get the lowdown on Lenny the firebug and his gang.

A military wife hires Hetty when a mysterious photographer starts stalking the woman's daughter and her fiancé. Tipped that an Australian is involved, Hetty and Geoffrey go undercover as ""Aussies."" They track down the mastermind and learn more than their client wants to know.

Called to investigate a string of robberies targeting Indian restaurant owners, Hetty herself is mugged! The plot thickens when Robert is the unwitting receiver of stolen goods. As Hetty delves deeper into the activities of the masked bandits, Geoffrey, sporting a stunning new hair-do, rides shotgun for her protection.

Hetty seeks compensation for the victim of a road rage incident in which a female driver hit another in the face.

Hetty looks into a case of bullying when her great nephew is suspended from school, after someone plants an Ecstasy tablet in his blazer.

Hetty represents a neighbour at a creditors' meeting and her agency is asked to find a missing company director and his money.

During a quiet hospital stay for surgery, Hetty uncovers a robbery ring run by nurses and helps clear D.C.I. Adams in a sexual assault frame-up. Meanwhile, Hetty's brother-in-law, Frank, gets mixed up with a lusty widow.

Hetty is approached by Hansi, a German gentleman whose golden years have been hampered by a painstaking search for his sister, whom he lost contact with during World War II. However, Hetty passes the case off to Geoffrey and Janet, when it comes to light that this is not the only pain Hansi has been suffering. Someone at his retirement community has been making pointed references to Nazism at Hansi, something he had never been a part of. The person is going so far as to deface Hansi's garden in the shape of a Swastika. Hetty goes undercover as a potential tenant of the retirement community, where she comes into contact with characters that seem to come right out of the mystery novel she's reading: a regimental romantic, a frail woman who has remained alone since her fiance's death in the war, among others. All seem to have motives for harming Hansi. Geoffrey and Janet find Hansi's nephew, only to find that he is ashamed of his uncle's German heritage and prefers to continue hiding. Mea

A clock aficionado suspects he's been handed stolen goods when two thugs bring him a valuable antique timepiece for repair. Meanwhile, Frank and Janet break Hetty's number-one rule by getting mixed up in a marital dispute. Oddly enough, the two cases turn out to be linked.