When Miss Farnaby's servant quits – like so many before her – Bert and Alice have to find a replacement. Yet, before the notice is even posted, a mysterious man, Mulberry, is on the doorstep to fill the position. With few other options, Miss Farnaby grants him the post; Alice and Bert, however, are dubious about his peculiarities.
It's Guy Fawkes Night at the manor, and everyone is getting ready in the traditional manner. Mulberry, excited about the forthcoming festivities, tries to express his glee, yet everyone around him is cold and aggravated about the whole event. Puzzled, Mulberry makes it his quest to understand why everyone loathes Bonfire Night, but still continues to celebrate it.
Mulberry is at it again; without Miss Farnaby's permission he takes it upon himself to enter her into a quiz. Although she is initially reluctant to acquiesce, in the end Mulberry finds a way to persuade her. At the same time, Bert and Alice plead their innocence in Mulberry's decision, unaware that Miss Farnaby has already agreed. When the pair discover he has convinced her to go in for it, they can't help feel a little usurped.
Miss Farnaby has been in a foul mood ever since her sister, Adele, left Farnaby Manor. No matter what Mulberry tries to say or do, she refuses to budge one inch from her slump of depression. What's worse is that she has started to become belligerent and abusive to both Bert and Alice, criticising their work at every turn. What – if anything – can break her out of this rut?
While on a shopping excursion in the village, Miss Farnaby is delightfully surprised to be recognized by the son of a former employee; that is, until he mentions that they had recently been pondering whether or not she was still alive. Incensed by the impertinence, Miss Farnaby resolves to have a dinner party. This news delights Mulberry because for once, it isn't based on his provocation; Bert and Alice, however, are none to pleased with having to hide their long-standing, petty embezzlement.