Another plot twist might be that the kidnapping was a misdirect. It could be that the kidnapper actually intended to target Sherlock all along and thought using Joan as bait would be the best way to draw him out. So, they set up this elaborate kidnapping scenario for her.
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.
Perhaps a really unexpected plot twist could be that Joan is not actually kidnapped in the traditional sense. Instead, she is being held in a place that she herself had some connection to in the past. Maybe a place she had visited during a case and unknowingly left some sort of loose end that has now come back to 'kidnap' her in a way.
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.
A really unexpected plot twist in this kind of fanfiction might be that the kidnapping was a mistake. The kidnapper was actually after someone else but got the wrong duck. This could lead to all sorts of comical or tense situations as they try to figure out what to do with the wrong captive. Also, the kidnapped character could discover a long - lost secret about their family during their captivity, which changes the whole dynamic of the story.
Maybe the kidnappers are actually part of a rival music group. They kidnap Austin and Ally to stop them from performing at a big event, which would give their own group a better chance to shine. They hold them hostage until the event is over.
Well, perhaps the kidnapping is a fake - out. Barry is actually working with the 'kidnappers' to infiltrate a criminal organization. He pretends to be kidnapped so he can get inside and gather information. This would add an interesting layer of deception to the story and could lead to some really exciting moments when the other characters start to figure out what's really going on.
One possible plot twist could be that the kidnapper is actually someone Nicole knew in the past, like an old acquaintance with a grudge. Maybe it was someone from her school days who had a secret crush on her and when she rejected them, they held onto that anger and now are seeking revenge.
A big plot twist could be that Artemis was actually faking his kidnapping as part of a bigger plan to infiltrate an enemy group. He lets himself be taken so he can gather intel from the inside.
One possible plot twist could be that Draco actually has noble intentions behind the kidnapping. Maybe he's trying to protect Hermione from a greater threat that she's unaware of. For example, there could be a dark wizard targeting her specifically, and Draco, despite his past enmity, decides to take matters into his own hands to keep her safe.
One possible plot twist could be that the woman discovers she has a special connection to the natives, like she is a long - lost descendant of their tribe. This would completely change the dynamic of her being kidnapped as they might start to see her as one of their own. Another twist could be that there is an internal power struggle within the native group regarding what to do with her. Some might want to use her for ransom, while others believe she is a sign from their gods and should be treated with respect.
A great plot twist would be if Pit was kidnapped as part of a larger plan to resurrect an ancient evil. And it turns out that Pit's very existence is the key to stopping this evil once and for all. So instead of just being a victim, he becomes the most important piece in a much bigger battle. His kidnappers might not even be aware of this, which would add to the complexity of the story.
A really interesting plot twist might be that Voldemort is being controlled by an even darker force, and Harry has to figure out a way to break that control while being held captive. Or perhaps Harry's friends, thinking he is dead, accidentally start a chain of events that end up helping Harry escape in a very unexpected way. For example, Hermione might cast a spell that was supposed to be for protection but ends up creating a portal right in Voldemort's lair.