Modern characters are defined by their careers and modern skills.
Reviewers and fans often note that At Your Door was incredibly prescient. Writing in the early 1990s, authors L.N. Isynwill and the Chaosium design team tackled concepts that remain deeply relevant today:
The world of horror fiction has been captivated by the eerie and mysterious tales of H.P. Lovecraft, and one of his most iconic creations is the short story "The Call of Cthulhu." Written in 1926, this tale has become a cornerstone of the Cthulhu Mythos, a shared universe of horror fiction that explores the idea of ancient, malevolent beings lurking in the shadows, waiting to reclaim the world. For those interested in delving into the world of Lovecraftian horror, a PDF version of "The Call of Cthulhu" can be a great starting point.
Because At Your Door was released in 1990, finding a physical copy often requires searching used book marketplaces like AbeBooks or Amazon . Regarding a :
An investigation into a strange, quarantined ecological zone where nature has begun to warp in impossible ways.
While some consider the campaign a "hot mess" or a "disaster" of a module, others in the Call of Cthulhu community appreciate it as a cult classic. The, or in print via sites like the Chaosium website or secondary market archives, provides a unique look at "Cthulhu Now." Pros of the Campaign
| Weapon | Base Range | Damage | Shots | Malfunction | | :--- | :--- | :--- | :--- | :--- | | | 15 yrds | 1D10 | 15 | 100 | | .38 Revolver | 15 yrds | 1D10 | 6 | 99 | | 12-Gauge Shotgun | 10 yrds | 4D6 / 2D6 | 2 | 99 | | AR-15 Rifle | 80 yrds | 1D10+2 | 30 | 99 | | Sniper Rifle | 150 yrds | 2D10+4 | 5 | 99 |
You can copy the text below into a word processor (like Microsoft Word or Google Docs), format it into two columns, and save it as a PDF to create a "Keeper's Screen" reference sheet or a "Quickstart Rules" handout.
: Older versions of this campaign have been criticized for using outdated and problematic racial stereotypes (specifically regarding the Tcho-Tcho people). Modern adaptations typically rewrite these sections to focus on the alien and uncaring nature of the Mythos rather than using real-world ethnicities as villains. Useful Resources
The supplement is broken down into several distinct scenarios, which can be run sequentially or adapted as standalone adventures:
If you acquire the PDF and prepare to run it for a modern audience, consider these adjustments:
If you are running the At Your Door PDF for your players in 2026, keep these tips in mind:
Physical copies of the 1990 softcover are rare collector's items that command high prices on the used market. A digital PDF preserves the book's striking classic artwork and detailed NPC profiles without the risk of damaging a vintage text.
If you search for At Your Door reviews online, you will quickly find a common theme: it is a campaign of contradictions, and its legacy is fiercely debated.
It features memorable villains, including a serpent person disguised as a preacher. Cons (The "Bad" Reputation)