Advanced Search

The Great Trap
Quick Preview
Full‑size Preview

The Great Trap


It is 1927, and a letter invites Investigators to the home of Professor Adhemar Osterman.  The letter is dated almost thirty years in the past, and bears each of the Investigators’ signatures.  They do not remember signing the letter, but they do remember the strange dreams that follow its receipt.  Dreams of signing a letter in the company of a man once a friend, now a stranger; of running from the shrill whistling of an invisible assailant; and of walking towards the trumpet sounds of a dying alien race.  Visions of what was, what is, and what may yet come to pass.

The Great Trap is the third in a short series of stand-alone modules for Call of Cthulhu 7th Edition, examining human concepts and experiences through the unknowable and alien Cthulhu Mythos. The Investigation features the Outer God, Yog-Sothoth, and explores themes of regret, obsession, and revenge. The scenario challenges Investigators to question who they are, what they might do, and how the answers to those questions change if only history plays out a little differently.  This scenario is also an homage to Dungeons & Dragons scenarios of yesteryear, and The Shadow out of Time by H.P. Lovecraft.

The Great Trap contains 66 pages in total, including: a 35-page scenario, 18 pages of handouts, 4 pages of NPCs and creatures, and 9 pages of pre-generated characters and background.

You can also watch a playthrough of this scenario on the Heinrich Moore Presents YouTube channel.

 More from this Title's Contributors
 Customers Who Bought this Title also Purchased
Reviews (1)
Discussions (0)
February 9th, 2021
The Great Trap is quite a ride! The Pre-Gen characters are AMAZING. They’re colorful, empowered and have extremely unique backstories and secrets. It was incredibly refreshing (and exciting) to play an empowered Investigator. However, despite the kno [...]
Browse Categories
 Follow Your Favorites!
NotificationsSign in to get custom notifications of new products!
 Recent History

Product Information
Community Content
Original electronic
Scanned image
These products were created by scanning an original printed edition. Most older books are in scanned image format because original digital layout files never existed or were no longer available from the publisher.

For PDF download editions, each page has been run through Optical Character Recognition (OCR) software to attempt to decipher the printed text. The result of this OCR process is placed invisibly behind the picture of each scanned page, to allow for text searching. However, any text in a given book set on a graphical background or in handwritten fonts would most likely not be picked up by the OCR software, and is therefore not searchable. Also, a few larger books may be resampled to fit into the system, and may not have this searchable text background.

For printed books, we have performed high-resolution scans of an original hardcopy of the book. We essentially digitally re-master the book. Unfortunately, the resulting quality of these books is not as high. It's the problem of making a copy of a copy. The text is fine for reading, but illustration work starts to run dark, pixellating and/or losing shades of grey. Moiré patterns may develop in photos. We mark clearly which print titles come from scanned image books so that you can make an informed purchase decision about the quality of what you will receive.
Original electronic format
These ebooks were created from the original electronic layout files, and therefore are fully text searchable. Also, their file size tends to be smaller than scanned image books. Most newer books are in the original electronic format. Both download and print editions of such books should be high quality.
File Last Updated:
February 06, 2021
This title was added to our catalog on February 06, 2021.