About the Game
In a city where power is measured in secrets, Kate Adler is no stranger to deception.
Your Story, Your Choices, Your Gameplay
A sharp-witted investigator with a talent for navigating lies, she's handed a rare lead, an invitation to Nocturne, the clandestine club where the elite shed their masks and morality.
But Nocturne is just the beginning.
What starts as a simple surveillance job unravels into a deeper conspiracy, missing girls, falsified identities, and a city stitched together by corruption. From neon-lit penthouses to sewer tunnels, Kate must follow the clues through every layer of society’s rot.
Every lead is a choice. Every truth, a risk.
And the deeper she digs, the more Kate realises: she might not be the hunter after all.
City of Sin – The Nocturne Files is a choice-driven visual novel that blends investigative gameplay with narrative branching.
You’ll uncover clues, question motives, and decide who Kate can trust as you navigate a world where every decision has weight.
Gameplay Overview
🔹 Choice-Driven Storytelling: AVN branching dialogue options and player decisions that shape Kate’s path and relationships.
🔹 Multiple Endings: Outcomes vary based on your choices, from investigative success to moral downfall.
🔹 3D Visuals: High-quality DAZ renders and immersive lighting that bring each environment and character to life.
🔹 Interactive Exploration: Investigate scenes, follow leads, and uncover hidden truths through narrative choices.
🔹 Mature, Emotional Themes: Power, manipulation, desire, and consequence are explored through adult storytelling.
🔹 Episodic Expansion: Regular free updates continue Kate’s investigation and expand existing routes no paid DLC or hidden content.
Summary
Genre: Narrative / Visual Novel / Mystery
Themes: Investigation, Corruption, Adult Choices
Mode: Single-player
Content Updates: Free episodic expansions
Ongoing Support & Content
This release includes all currently playable chapters and major branching routes.
Future updates will add new episodes, scenes, and endings all included with your purchase at no additional cost.
No microtransactions, no paywalls, just an expanding world shaped by your choices.
Screenshots
22 images
Version Information
Steam Patch Notes
Official update history
Following an update to Steam's integration, the previous build could encounter an error during startup due to a compatibility issue between the version of Ren'Py used to build the game and Steam's updated API.
This build updates the game to the latest Ren'Py version and its updated Steam integration.
Changes:
Updated Ren'Py engine
Updated Steam integration
Fixed an issue that could prevent the game from launching through Steam
There are no changes to story content or saves in this build — it's purely a compatibility hotfix.
Thanks for your patience, and apologies to anyone who ran into the issue! ❤️
— DoAdventures
• 2,948 renders
• 33 animations
• Almost 99,000 words
• 3.2 GB of content
• 22 achievements
• A brand new walkthrough system
• A ridiculous amount of branching choices
This episode goes far deeper into Tricity’s underbelly, relationships, corruption, manipulation, therapy sessions, dreams, conspiracies, assassinations, romance, and some moments I genuinely cannot wait to see people react to.
Fight the muscle mommy.
Join the muscle mommy.
Avoid the muscle mommy entirely.
Or just sit with coffee and slowly uncover the city’s secrets.
Hi everyone,
Thanks to ongoing feedback and requests from the community, I’m happy to say that I’ve now resolved the translation and font issues, and the game has been updated with the following language support:
Chinese
French
German
Italian
Russian
Spanish
Turkish
This update improves readability and font rendering across all supported languages, making the experience more accessible for a much wider audience.
Your messages, reviews, and discussions genuinely helped push this forward and more languages are already planned as development continues.
I’ll be updating the store page shortly to reflect the new language support.
As always, thank you for playing, for the feedback (good and bad), and for helping shape City of Sin - The Nocturne Files.
— DoAdventures
Current Release
Build 23469175
Uploaded Jun 30, 2026
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System Requirements
How to Install
CityofSin.exe to play
Troubleshooting tips
• Run Redist/_CommonRedist installers if game won't start
• Add folder to Windows Defender exclusions
• Run as administrator
Download
Direct link available
Needed when extracting (WinRAR / 7-Zip) — not a site login.
4439E9DA
745cf84e2051381d843caa7e7465d2627ade4112a2bb36353b97e2f97e14f9cb
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Download City of Sin - The Nocturne Files for PC with a direct link or via torrent. Get the full version of City of Sin - The Nocturne Files for free. City of Sin - The Nocturne Files is a Casual released by DoAdventures.