
In a city where power is measured in secrets, Kate Adler is no stranger to deception. 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.
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About
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.
Stats
All-time low is the lowest price we've recorded for this game since we started tracking it.
Languages: English, French, Italian, German, Spanish - Spain, Russian, Simplified Chinese, Turkish
Engagement
Hours played at review time, across 31 reviews with recorded playtime.
Reviews
A very entertaining story with loads of erotic content. The narrative and dialogues are witty and credible. It's a low cost game worth checking out.
Finally got this game. Needs more content. Promising future. I like that the story can change just by saying yes or no to certain events. Hopefully some of them can be expanded. Maybe also make there be more options not just two. For example games like Guild Wars 2 sometimes you 3-4 options. Same with SWTOR for dialogue choices usually is 3.
A narrative-based story, with a very "Eyes Wide Shut" feel. Firstly, I cannot overstate how *gorgeous* the MC is. Kate is absolutely stunning, and *beyond* sexy. The story does some fantastic service to fans of the more taboo elements. BDSM and Corruption among many others. CoS's artwork is beautiful, as well, and goes a long way in selling just how sexy Kate is. The user interface is one of the most polished i've ever seen in an AVN. There's just something about Kate. I dont know what else I can say. I'm absolutely obsessed <3 But that's something to consider. If you love a character that much, and can't even say why? (aside from the obvious physical attraction). Then that - to me - says "remarkably well written". Done very naturally, in a way that you would *expect*. I was always a bigger fan of more realistic dialogue in AVNs, as opposed to tropey, recycled nonsense. And CoS most definitely delivers on that front :)
Short, but interesting so far. Long way to go before its really ready, but already worth getting.
Very short game, with potential that I look forward to seeing in the next chapter, I will give a positive vote, on the basis of trust, hopefully well placed Gioco molto breve, con potenzialita che aspetto di vedere bel prossimo capitolo , metterò un voto positivo, sulla fiducia, speriamo ben riposta
Great start, hoping for more to come. Great cast and story. Thanks!
so good if u are for lesbian this wow
It says there is a Turkish language option, but there isn't! And the game is extremely SHORT!!! It's a shame, a game with such potential shouldn't be wasted like this!
City of Sin - The Nocturne Files - 2/10 ★★☆☆☆☆☆☆☆☆ Рендеров пара штук, и те низкого качества. Сюжет и повествование сумбурные. Все сделано на коленке, не рекомендую даже по скидке.
plus que decevant l'histoire est déjà pas terrible mais en plus des qu'il y'a une scene de "sexe" kate se sauve et nous frustre nous !
Related
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Trends
Concurrent players on Steam, sampled daily since tracking started.
Audience
Estimated from the language of this game's reviews — a proxy for where players are, not official Steam demographics.
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