Halcyon: Cyberpunk-Noir One-Shot

Her partner walked into your place at 2 a.m. and said: “They’re erasing her, and by morning I won’t even remember her name. Please. Help me keep her.”

The Premise

In the perfect megacity of Halcyon, the worst thing isn’t being killed. It’s being deleted: scrubbed from the records, erased from the systems that are the only proof you’re real, until it’s like you never existed. Tonight it’s happening to a woman named Dani Cho, in stages, and her partner Mara is the last mind that still holds her, and she’s losing the grip in real time. Your players are fixers who work the cracks of Halcyon, and they have until dawn to find out who’s erasing Dani and why, and to put her back, into the record or at least into a memory the city can’t reach, before the sun comes up and Dani Cho was never born.

A complete, self-contained cyberpunk-noir mystery for one session of about three to four hours, ready to run with almost no prep.

What You Get

• A complete one-shot: the read-aloud opening, the GM-only truth, a full suspect cast, a beat-by-beat night against a dawn-and-memory clock, the climax, and three true endings.
• Print-ready player handouts (the dissolving hole, a “no record” non-result, the recording that hangs the scrubber).
• A GM toolkit for pacing the single session, plus tone anchors and the one rule that makes the horror land.

Why It Runs Well at the Table

• A true, fair-play mystery: the deleted can’t speak, so the crew reconstructs the truth from the shape of the hole the scrub couldn’t reach.
• Dread and moral weight over gunsmoke: you can’t shoot a cover-up, and killing the scrubber doesn’t bring anyone back; only surfacing the proof and restoring the person does.
• A self-contained night with a hard clock and a gut-punch choice, that also quietly opens a much larger mystery.

System-Agnostic

No stat blocks, no rules, no math. Run it in any cyberpunk-capable or generic system, or rules-light by tension alone. Netrunning and chrome are kept narrative, and the only “magic” is the bureaucratic power to edit a person out of existence. An optional ruleset-neutral GM hook handles the tech.

Content Note

Mature cyberpunk themes: disappearance, corporate murder by erasure, a person being unmade in real time. Dread and moral weight over gore, with violence consequential. Includes a safety-tool recommendation up front.

What’s Inside

• The Halcyon one-shot mystery (PDF, print-ready 8.5 x 11)

This Is Also a Doorway

Loved the night and want the whole city? This one-shot is the opening of a full campaign. Halcyon: Campaign Codex + GM Kit turns this single case into the first of many and uncovers the program behind the deletions, with the complete codex plus a 5-session Session Planner and a 2-page Campaign Tracker. Find it in the Narrative Hall shop.

License

For personal use at your table. Run it, print it, adapt it for your own games. Please do not resell or redistribute the file itself. Non-exclusive: available to every GM who wants it.

The Architecture of Legend. We Build the Foundation. You Tell the Story.