Originally posted at www.throatpunchgames.com, a new idea every day!
Product-Doors to Darkness
System- Call of Cthulhu, 7th Ed.
Producer– Chaosium
Price– $17.48 here https://www.drivethrurpg.com/product/199593/Doors-to-Darkness
TL; DR-Decent intro with some basic Call of Cthulhu adventures. 90%

Basics– What’s in the basement? Doors to Darkness is a collection of five simple adventures that beginner keepers can bring to the table to introduce Call of Cthulhu to their friends and get new players involved on both sides of the GM screen.
Mechanics or Crunch– What’s here is good, but I would like a bit more. The crunch of the adventures (monsters, skill checks, basics of play) are all done well. My one major criticism is there is not a lot of extra information to help newer keepers/game masters learn the ropes. I would like a bit more GM box text to help a new game master run the game. Since the players and the GM are most likely new, that would really help everyone learn exactly what they are doing. Solid work but this book needs a bit more basics explained to the GM. 4/5
Theme or Fluff– This book has some solid stories that may be a bit disjointed. There are five stories that range from snake cults to undead horrors. Nothing is bad and these are excellent introduction stories, but none of these are really connected. It leads to a bit of a random experience that can end up being kind of a monster of the week. Not bad, but do not expect a long running campaign, but a more introductory experience. 4.5/5
Execution– Here is where Chaosium excels. Chaosium makes amazing digital props and electronic resources for their adventure. Solid layout, digital links, and good text make for an easy to read experience. The book of notes is also an amazing piece that really helps me as a keeper draw in my players. And there are several premade characters that any player could pick up and start playing right away. Fantastic execution Chaosium! 5/5
Summary– Overall, this is a solid effort to help new players get into Call of Cthulhu. For about 18 bucks you get five adventures with decent plot, solid tools and great handouts to draw new and old players in. New keepers will have a bit of trouble as this could use a bit more tools to help newer ones with the rules. But if you want to start Call of Cthulhu and need a good starting point, this is a great place to begin. 90%