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Delta Green RPG
Delta Green: A Night at the Opera
Six Terrifying Scenarios
"The sciences, each straining in its own direction, have hitherto harmed us little; but some day the piecing together of dissociated knowledge will open up such terrifying vistas of reality, and of our frightful position therein, that we shall either go mad from the revelation or flee from the deadly light into the peace and safety of a new dark age." —H.P. Lovecraft, "The Call of Cthulhu"
A Night at the Opera collects six Delta Green operations that were previously published only in PDF or in standalone paperback modules. Combined, they expose a team of Agents to the edges of the horrors of the world of Delta Green, then suck them into abysses of fear and desperation from which the world itself may never emerge.
REVERBERATIONS: An introductory scenario in which the Agents confront foes that were old before Delta Green was born. By Shane Ivey.
VISCID: Investigating a geneticist's gruesome death, the Agents confront lethal conspiracies and horrors that never should have been made. By Dennis Detwiller. (Available on its own in late December 2017.)
MUSIC FROM A DARKENED ROOM: The Agents must investigate a house that may be haunted by things more terrifying than ghosts. By Dennis Detwiller.
EXTREMOPHILIA: Can the agents stop the spread of a terrifying threat? Or will they become just another vector for the disease? By Shane Ivey.
THE STAR CHAMBER: The Agents must hear and adjudicate a horrific after-action report from another team—by way of playing out scenes from the earlier mission in between scenes of the present day. By Greg Stolze.
OBSERVER EFFECT: The Agents investigate a cutting-edge physics laboratory that may have looked a little too deeply into the nature of reality. By Shane Ivey.
An index helps Handlers build broader connections between horrors in their campaigns.
Delta Green: A Night at the Opera is 204-page hardback in full color. Its scenarios are playable with the Agent's Handbook and the Handler's Guide, or with the quickstart rules in Delta Green: Need to Know.
"The sciences, each straining in its own direction, have hitherto harmed us little; but some day the piecing together of dissociated knowledge will open up such terrifying vistas of reality, and of our frightful position therein, that we shall either go mad from the revelation or flee from the deadly light into the peace and safety of a new dark age." —H.P. Lovecraft, "The Call of Cthulhu"
A Night at the Opera collects six Delta Green operations that were previously published only in PDF or in standalone paperback modules. Combined, they expose a team of Agents to the edges of the horrors of the world of Delta Green, then suck them into abysses of fear and desperation from which the world itself may never emerge.
REVERBERATIONS: An introductory scenario in which the Agents confront foes that were old before Delta Green was born. By Shane Ivey.
VISCID: Investigating a geneticist's gruesome death, the Agents confront lethal conspiracies and horrors that never should have been made. By Dennis Detwiller. (Available on its own in late December 2017.)
MUSIC FROM A DARKENED ROOM: The Agents must investigate a house that may be haunted by things more terrifying than ghosts. By Dennis Detwiller.
EXTREMOPHILIA: Can the agents stop the spread of a terrifying threat? Or will they become just another vector for the disease? By Shane Ivey.
THE STAR CHAMBER: The Agents must hear and adjudicate a horrific after-action report from another team—by way of playing out scenes from the earlier mission in between scenes of the present day. By Greg Stolze.
OBSERVER EFFECT: The Agents investigate a cutting-edge physics laboratory that may have looked a little too deeply into the nature of reality. By Shane Ivey.
An index helps Handlers build broader connections between horrors in their campaigns.
Delta Green: A Night at the Opera is 204-page hardback in full color. Its scenarios are playable with the Agent's Handbook and the Handler's Guide, or with the quickstart rules in Delta Green: Need to Know.
204 pages, Hardcover
Published August 1, 2018
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Displaying 1 - 8 of 8 reviews
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December 25, 2023How? My DG read.
What? A collection of six adventures, all released (and maybe reviewed by me?) separately:
* Reverberations -- the PCs trace some drugs from the Tcho-Tcho and discover a monster
* Viscid -- there's a monster, it's a person horribly mutated by contact with aliens
* Music from a Darkened Room -- a haunted house
* Extremophilia -- there's a few monsters, all people horribly mutated by contact with aliens
* Star Chamber -- there was a DG disaster, now the PCs are judges AND have to play the original disaster
* Observer Effect -- a physics experiment is collapsing time, the PCs have to replay the same day until they can stop it
Yeah, so? As reviewed separately, I think Viscid and Observer Effect are stone cold classics; Music is a deeply depressing investigations into all the families destroyed by the ghost-thing; Star Chamber is a fascinating play wih the form; Reverberations is a short adventure that highlights how times have changed or not (are the Tcho-Tcho really still villains?); and Extremophilia is also real good, but hits a lot of the same beats as Viscid, without the heights of horror.
What? A collection of six adventures, all released (and maybe reviewed by me?) separately:
* Reverberations -- the PCs trace some drugs from the Tcho-Tcho and discover a monster
* Viscid -- there's a monster, it's a person horribly mutated by contact with aliens
* Music from a Darkened Room -- a haunted house
* Extremophilia -- there's a few monsters, all people horribly mutated by contact with aliens
* Star Chamber -- there was a DG disaster, now the PCs are judges AND have to play the original disaster
* Observer Effect -- a physics experiment is collapsing time, the PCs have to replay the same day until they can stop it
Yeah, so? As reviewed separately, I think Viscid and Observer Effect are stone cold classics; Music is a deeply depressing investigations into all the families destroyed by the ghost-thing; Star Chamber is a fascinating play wih the form; Reverberations is a short adventure that highlights how times have changed or not (are the Tcho-Tcho really still villains?); and Extremophilia is also real good, but hits a lot of the same beats as Viscid, without the heights of horror.
April 28, 2021
Another amazing collection of mind eroding scenarios for Delta Green. This collection includes some of my favorite scenarios to run, and are both fascinating and horrifying. The quality of writing, layout, and art is top tier as always. Highly recommended.
November 22, 2025
This is the sixth book I've read from the Delta Green Humble Bundle.
This book consists of 7 shorter modules: Reverberations, Viscid, Music from a Darkened Room, Extremophilia, The Star Chamber, and Observer Effect. Reverberations sees the players dealing with a cartel that is well established in the universe's lore that makes use of the supernatural while carrying out their criminal enterprises. The cartel had been quiet in recent years but had recently resurfaced with a drug called Reverb that has been connected to a number of strange disappearances. In Viscid the players help investigate a bizarre crime scene involving a rogue geneticist and a strange blue substance that's far more sinister than it appears. Music from a Darkened room sees the Agents looking into the vicious haunting of a seemingly cursed suburban house. Extremophilia thrusts the Agents into a scenario where they must find out why a number of people from a notorious research firm have begun acting strangely and how to stop the horrid thing behind it all. In The Star Chamber the Agents must interrogate a number of other agents who survived an operation that went sideways and figure out why it went sideways and whether any of those agents were involved. The final module, Observer Effect, sees the Agents rushing to stop a terrifying world ending event that has an unsettling strain of deja vu.
All of these modules are really good (though one or two of the first few could use a little clarifying in how the story is meant to progress) but I want to focus on the last two. These are two of the most complex modules I've ever seen. In Star Chamber the players have to bounce back and forth between roleplaying both their own characters and the characters be interrogated. I have never seen that in any RPG before and it's not something I'd try with new players. In Observe Effect the players are racing against one of the most insurmountable horrors in this game's universe to prevent it from eating their entire reality. The thing is, if they fail, they get a few more opportunities to try again as reality resets, albeit closer to the time where the world ending event takes place than in the previous reality. You'd have to have a really experienced table because even with good scores in the right skills the dice could still undermine their efforts, which would get really frustrating really quickly as the game gets harder and more tense with each reset. These modules would be a ton of fun with the right group but with the wrong group I feel like this book might break up a table in short order.
This book consists of 7 shorter modules: Reverberations, Viscid, Music from a Darkened Room, Extremophilia, The Star Chamber, and Observer Effect. Reverberations sees the players dealing with a cartel that is well established in the universe's lore that makes use of the supernatural while carrying out their criminal enterprises. The cartel had been quiet in recent years but had recently resurfaced with a drug called Reverb that has been connected to a number of strange disappearances. In Viscid the players help investigate a bizarre crime scene involving a rogue geneticist and a strange blue substance that's far more sinister than it appears. Music from a Darkened room sees the Agents looking into the vicious haunting of a seemingly cursed suburban house. Extremophilia thrusts the Agents into a scenario where they must find out why a number of people from a notorious research firm have begun acting strangely and how to stop the horrid thing behind it all. In The Star Chamber the Agents must interrogate a number of other agents who survived an operation that went sideways and figure out why it went sideways and whether any of those agents were involved. The final module, Observer Effect, sees the Agents rushing to stop a terrifying world ending event that has an unsettling strain of deja vu.
All of these modules are really good (though one or two of the first few could use a little clarifying in how the story is meant to progress) but I want to focus on the last two. These are two of the most complex modules I've ever seen. In Star Chamber the players have to bounce back and forth between roleplaying both their own characters and the characters be interrogated. I have never seen that in any RPG before and it's not something I'd try with new players. In Observe Effect the players are racing against one of the most insurmountable horrors in this game's universe to prevent it from eating their entire reality. The thing is, if they fail, they get a few more opportunities to try again as reality resets, albeit closer to the time where the world ending event takes place than in the previous reality. You'd have to have a really experienced table because even with good scores in the right skills the dice could still undermine their efforts, which would get really frustrating really quickly as the game gets harder and more tense with each reset. These modules would be a ton of fun with the right group but with the wrong group I feel like this book might break up a table in short order.
December 20, 2025
One of the best campaign supplements of all time. A Night at the Opera is a collection of a bunch of pre-published adventures that provide plenty of player freedom, copious amounts of horror, and some surprising twists on classic formula. It also offers the players the potential to affect the metaplot by potentially bringing in former MAJESTIC leader Gavin Ross. My favorite of the adventures is definitely where you have the opportunity of determining who is guilty in a Rashomon-esque story.
October 28, 2018
Definitely a nice group of missions. Two definitely will be a challenge to run, but worth it if they work.
I've currently only run one of the missions from the book and it was a fun two sessions. Like all Delta Green/COC adventures it heavily relies on the handler to modify on the fly.
Definitely recommend for modern games.
I've currently only run one of the missions from the book and it was a fun two sessions. Like all Delta Green/COC adventures it heavily relies on the handler to modify on the fly.
Definitely recommend for modern games.
December 3, 2023
More like 3.75. I am neck deep into finding all Delta Green lore so I am reading everything and anything I can get my hands on. The scenarios were OK. Luckily most of the product these guys put out are pretty solid. If you find this super cheap, I would encourage you to buy it.
January 3, 2023
Hit-and-miss scenario collection. Full review: https://refereeingandreflection.wordp...
October 30, 2019
Abhorrent Operettas—A review of A Night at the Opera: Six Terrifying Operations for Delta Green: The Role-Playing Game published by Arc Dream Publishing.
http://rlyehreviews.blogspot.com/2019...
http://rlyehreviews.blogspot.com/2019...
Displaying 1 - 8 of 8 reviews