The mysterious Mulberry arrives, carpet bag in hand to apply for the recently vacated position of companion to the elderly and reclusive Miss Rose Farnaby. Strangely, Miss Farnaby's staff hasn't even had time to post the vacancy before the mysterious Mulberry arrives to fill it. Mulberry manages to persuade Miss Farnaby that he does have experience and is fully capable of handling the new position. She finally relents and hires him for the job, and the fun begins. His first task, to convince Miss Farnaby to part with a childhood rocking horse and give it to her grand-nephew. Miss Farnaby is soon wondering why she hired him........

It is Guy Fawkes Night at the Farnaby manor and time for the traditional bonfire. Miss Farnaby supports the bonfire but normally does not participate or if she does, she does so from a distance. Well now, Mulberry is determined to end this non-participation by his employer, and sets out to make the night one to remember, with fireworks included in the evenings festivities. As usual, Bert and Alice think that they should not have to do everything by themselves and fully expected Mulberry to assist them, which of course he doesn't, much to their dismay.

It is time for the local village's Annual Quiz Contest. Mulberry manages to convince Miss Farnaby that they should enter a team in the contest and that they will be a cinch to win it. Things take a change for the worse when Miss Farnaby's sister Adele, who has bested her at everything her whole life, decides to enter the contest as well, against the team of Miss Farnaby and her staff.

Miss Farnaby, refreshed from her outing with Mulberry, decides to have a dinner party at the manor. Of course, Bert and Alice are upset at the extra work involved, but have no choice but to prepare the evening meal, constantly battling with Mulberry over the preparations. It seems that Miss Farnaby's dinner party is destined to be a success when an unforeseen event occurs that could ruin more than just the dinner party.

Mulberry decides to make a safety check of the manor. Much to Bert and Alice's dismay, he declares the manor a death trap. Thinking of this and the implications causes him problems. His father appears again and in frustration, Mulberry decides the only way to protect Miss Farnaby is if he leaves the manor as suddenly as he came. This turn of events provokes a battle between him and his father on who is really in charge and who is going to ""take care of"" Miss Farnaby.