15 things on my one shot idea: The "chosen one" has gone missing

So I wrote a list of 15 one shot ideas, then narrowed it to five, and now I'm narrowing it to three and doing a pageish on each one. Did I miss your favorite? Let me know!

1. Vibes: Avatar: The Last Airbender meets a bit of The Hunger Games
2. How the party knows each other: They are an established adventuring party, but beyond that, relationships are up to the players.
3. Opening scene: The party is ushered to a back room of a luxury inn where they see the beautiful Aba Avo fretting. She is fretting and clearly nervous. She bades the party to sit down and explains the situation. "The Qua Bo has gone missing. It is vital that we locate them. I need your help."
4. A note on the town/city/village: The religious capital of the Catche Kingdom is the town of Guacaht, where the adventure begins. It's a large town with a lot of religious tourism and religious focus overall. It was recently at capacity with the Evokados Ceremony taking place.
5. A note on the government: This is a monarchy, but with vassals. There is also an element of religious approval for the ruling monarch. At this time, a new monarch, King Avo has taken the throne, but has yet to be blessed by the Qua Bo as the previous Qua Bo died before King Avo ascended the throne and a new Qua Bo has just been found.
6. A note on religion: This is a polytheistic world with the belief that the chosen one, aka the Qua Bo, is the bridge between the gods and this realm. I will be flexible about what gods are in this pantheon with the players. However, there is some level of religious reverence for the Qua Bo themself and there is, essentially, a Qua Bo church that all of the kingdom belongs to. There is also a magical element to religion (see below). While it is not a theocracy, there is a strong connection between the church officials and the government (e.g. the monarch is blessed by the Qua Bo). The Evokados Ceremony can only take place on a new moon that is at the beginning of a month. The ceremony draws children from all over the Catche Kingdom to go through a series of trials. The one who succeeds is dubbed the Qua Bo, the bridge.
7. A note on magic in the world: Magic is highly tied to religion. It is seen to come to be because of the connection formed between other realms and this one by the chosen one, aka the Qua Bo, regardless of how people get their magic. Thus it is seen as a powerful and somewhat religious thing.
8. Party restrictions (e.g. class, age, species): Players must be adults and must reasonably be a cohort. Class is open except for bloodhunter. All basic rules' species are open.
9. How different species (or races) are viewed in the world: This is a fairly egalitarian society, so most businesses can accommodate all species. Divisions more come from money.
10. What item(s) can the party have at the beginning of the adventure: This is somewhat flexible since the party is an established group that gets stuff done. However, I do not picture them as terribly rich so it's not unlimited what they have. They are also in their hometown or at least a common home base so they would know where they could find anything they need.
11. Maximum party size: 5
12. Who has hired the party: The envoy to the king who was supposed to ensure the Evokados Ceremony went as planned
13. What (if any) is the reward?: Money and/or political favors
14. An NPC the party will encounter: Aba Ado, the envoy to the king. She is a nervous elf having been recently appointed by King Avo. She is desperate to find the Qua Bo and get King Avo blessed, maintain balance in the kingdom, and keep her job.
15. The paragraph I wrote in summary: Recently, the Evokados Ceremony has taken place and the new spiritual leader, said to bring about a golden age in the kingdom, was chosen by a set of symbolic trials. However, this new leader is a young child who is now nowhere to be seen. The first step will be to talk to the aging spiritual leader, said to be a great seer, or to talk to the child's parents. I imagine this one to be a bit of a cat-and-mouse game filled with puzzles and tough decision-making, ultimately making the party wonder what is the right course of action for this child and whether or not the child should be found or is even still alive.

(Prompt by me)

"Roll a D20 for Photography Skill (34/365)" by Jo. Attribution-NonCommercial 2.0 Generic.