This will remain a one-shot.
It's what I imagine it must've happened after the end.
I mean, we all see that lady mouse walking in after Olivia and her father leave.
The rest is fair game, right? :D
The fire was gently cracking in the fireplace, and the warmth of the room was more than enough for the young female mouse to feel somewhat at ease around the slender mouse detective and his tubby colleague, Dr. Dawson. Basil was looking at her astutely, as the profile was starting to paint itself in his mind - she must've lived in modest lodgings, had quite the trouble lately and didn't seem like she slept well - and in all certainty, this must've been a very important deal for her to come in here.
He sat on his large armchair, while Dawson took a seat on a rectangular stool and the young lady sat herself in the smaller armchair, just across Basil. The slender mouse was slowly puffing from his pipe, as he didn't even bother to change into somewhat decent attire - he was still wearing his purple dressing gown - and listened intently to what the troubled lady had to tell him. The female mouse's paws were shaking lightly, as she didn't know exactly how to begin her sorry tale, while her eyes were shifting back and forth to the fireplace and the door.
Eventually, after a few moments of hesitation, she left out a small sigh and started speaking, cutting through the gentle creakling of fire.
"Mister Basil, I am grateful you took the time to answer my letter..." she paused, as if to keep her mind clear, "...and that you're listening to my plea."
"Your letter spelled disaster..." Basil said as he opened his tired eyes for a moment. "Please, just start from the beginning."
The female mouse left out a soft sigh as she looked again towards the door, and said "Very well, I will not try to take away too much time..."
Dawson shifted a little in his seat, his eyes going back and forth to Basil and the young, as of yet, unknown female mouse, whose expression betrayed a great degree of sadness and - disbelief, maybe? He wasn't a very good judge of character like Basil was, but his analysis was not exactly far from the truth - she was indeed upset.
"You see, I've had this assistant for a long time," she said with a frown, "...and she's gone missing since yesterday. Mice in town have been saying you're the best detective around, and..."
She was interrupted by a lazily raised paw, as Basil looked at her intently, a small smile on his muzzle. "...And you want me to find her, isn't it?"
"Yes." she said with a sad nod, while Basil was rubbing his paws in excitement, his eyes shining.
"This case of yours, Miss, is quite similar to the first - though do not fret, we will find your dear friend." the slender mouse rose from his armchair.
"Th-thank you, Mister Basil!" the female mouse said as she couldn't help hugging Basil, the latter shocked by such a warm-hearted gesture.
"Pl-Please, you can let go now." Basil said in a somewhat strangled voice. "All will be fine."
And that marked the beginning of a new adventure for Basil and Dawson.
