It could be a criminal that Sherlock and Joan put away. This person might have escaped from prison or had an accomplice on the outside who planned the kidnapping as revenge. For example, a mastermind criminal who lost a lot because of their capture.
You can start by visiting fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions, and you can simply search for 'elementary sherlock x joan' in the search bar. Another option is FanFiction.net, where you are likely to find a good number of stories related to them as well.
Some popular elementary sherlock x joan fanfictions include 'The Unexpected Alliance'. This one takes their relationship to a new level by creating a situation where they have to form an alliance that goes beyond their usual detective - doctor dynamic. 'The Trust Factor' is another good one. It emphasizes how much they trust each other, which is a crucial aspect of their relationship. And 'The Unspoken Understanding' explores the unspoken communication that exists between them, which is very fascinating.
One possible plot twist could be that Joan's kidnapper turns out to be someone she knew in the past, like an old acquaintance with a grudge. Maybe it was someone from her college days who felt she had wronged them in some way.
One popular theme could be the slow - burn aspect. It might start with a gradual realization of their feelings for each other. For example, they could be working on a case together and there are these little moments of tension and connection. Another theme could be the 'forbidden love' idea. Since they are partners in solving crimes, a relationship might be seen as unprofessional or risky in their world. Also, a theme of self - discovery through the relationship. As they kiss and enter into a more romantic relationship, they learn more about themselves and how they function in a relationship compared to just a working partnership.
One interesting story could be where Holmes and Watson's relationship evolves gradually. They might share a kiss during a moment of great danger when they think they might not survive. It could be a spontaneous act of pent - up emotions.
The kiss can be a turning point. It can make their relationship more intimate and deepen their emotional bond. They might start to trust each other on a whole new level.
Often, they start as close friends and partners in solving crimes. There are many shared moments of danger, trust - building, and late - night discussions. Their relationship deepens as they understand each other's quirks and strengths more and more.
Joan of Arc was a French peasant girl. She believed she had received divine visions instructing her to help drive the English out of France during the Hundred Years' War. She showed great courage and leadership, leading French troops to several important victories.
In the context of 'joan johnston fantastic fiction', Joan Johnston is likely the author. She is the one creating the fictional works that fall under this 'fantastic fiction' category.