Would love a cheap (preferably free) One-Shot Adventure, rules-light I could start playing RN

Halloween Sale on itch.io

Looking for an adventure I can just plug into immediately and start playing within ten minutes. Preferably free. But i've seen quite a few running for about 1-3 bucks.

Thematically I am open to anything other than fantasy. Sci-fi, Lovecraftian, Mystery, Weird West, Gothic-horror, Weird-psychedlia like UVG and Vaults of Vaarn are a few of my favorite genres but open to anything.