City of Sin – The Nocturne Files

Kate Adler gets an invitation to Nocturne, the club where the city's elite drop their masks along with everything else, and what looks like a simple surveillance job turns into something much messier. The writing leans sharp and a little cynical, matching a protagonist who trades in lies for a living.

The job was supposed to be easy: watch, report, collect a paycheck. Instead Kate finds missing girls, faked identities, and a conspiracy that runs from neon penthouses down to the sewers under the city. Every contact she cultivates and every lead she chases pulls her further in, until she starts to wonder if she's the one being played.

Play consists of working through Kate's investigation as a visual novel, choosing which leads to follow and which people to get close to, with her infiltration of Nocturne's world bringing her into contact with the club's clientele and staff along the way. The choices are framed as risk versus payoff rather than simple flavor text, so poking at the wrong secret has consequences later.