It is the tenth anniversary of Fowler and Dawkins' relationship, but Fowler manages to forget, being instead more concerned with the Queen's Official Birthday.

Habib falls for a fireman named Gary, much to Goody's jealousy, while Fowler finds himself pestered frequently by a man who claims to have committed impossible, solved or extremely historical crimes, much to DI Grim's amusement, until a terrorist begins making threats that cause Special Branch to become involved.

After Fowler drunkenly admits to having kissed Habib during a pub quiz match, Dawkins begins to suspect the two of having an affair behind her back when Grim enlists Fowler and Habib's help in catching a criminal via entrapment.

It's Rag Week in Gasforth, and Fowler and his men are frequently disturbed by teenagers in scary masks – that is until a bank robbery by three men in rag masks occurs while Dawkins is there, leaving it uncertain whether or not the robbery is genuine.

Pestered by his ex-wife, Fowler reluctantly agrees to let his son Bill stay with him and Dawkins for a fortnight. When Dawkins overhears Bill making love to his girlfriend in the bedroom, she becomes envious and attempts to talk Fowler into going to see a sex therapist. Guest appearance by Sheila Gish.

Goody buys Fowler a puncture repair kit and Habib some lingerie, but accidentally gives them the wrong presents, and matters are made more complicated when Dawkins believes the lingerie is a gift for her from Fowler.