Небо – угроз не слышит
Небо – ведёт особый счёт
Небо – тебя найдёт
New here? I'm Roha — want a quick tour?
Born. Thought a little. Grew bigger.

As far as I know, gelatin is initially a fine powder that is mixed with hot water, and it significantly increases in size over time. IMHO, this is a significant clue.
When the elves arrived, they found a piece of paper smeared with gelatin
Gelatin is a transparent and solid amorphous substance that has: a colorless color or a slight light yellow tint, tasteless, odorless. When soaked in water, it absorbs water, swells, and softens, and its weight increases from 5 to 10 times. Gelatin easily destroys bacteria. It dissolves in hot water, acetic acid, or hot drinks, and mixes with glycerin and water, but does not dissolve in organic solvents.

By the way, I still don't understand how you can even find a clue on iron. Did one person kill two people at once?

Translate, please.

So, I read that the newspaper mentions the recruitment of a Puppeteer, but it doesn't list any nicknames. There's nothing about puppets in the newspaper, so either he was blocked or he was killed.
...The mole's attention was drawn to a passerby nervously trying to pick out threads from his hair, which were also sewn onto his clothes, and olive pits were falling from his hat...
Well, it's obvious that jelly is made from gelatin.
Okay, I confess – I'm a sentient gelatin. Don't shoot.
Hmm, so our puppeteer is alive and gathering a team. Maybe the olive pits are a clue? Or is this a hint that the doctor has become a puppet?

I have a feeling that our valiant GM has prepared as much jelly in his life as I have built railroads. Therefore, gelatin and jelly are the same thing for him.
What's the point?
Born. Thought a little. Grew bigger.