Michael Wolf reviews The Book of Unremitting Horror here on Stargazer’s World:

In my option The Book of Unremitting Horror is a must-have for any GM interested in running horror campaigns, regardless if he/she is using a GUMSHOE game or not.

A review of Esoterrorists:

… the game does deliver on its promise. You could easily explain the rules to someone in 15 minutes enough so that they could play. You can also learn them enough to run the game in about an hour. There are some spots you’d still need the book (for tables and such) but you could do it.

A very positive review of the Esoterror Factbook by Kingbeast (9/10)

“ I honestly think that this might be one of the best supplemental books that I have read for ANY setting…it is that good”

The podcast The Game’s The Thing gives a positive review to The Esoterrorists. It’s a good intropYou’ll find the review starting at 26 minutes and 50 seconds.

I was apprehensive about the system but I was wrong – it worked really well for me.

On his blog Transitive Gaming, R B Bergstrom gives an overwhelmingly positive review to The Esoterrorists, calling it “The best mystery/investigative RPG ever”.

Over on LiveJournal, there is a balanced and good review of Gumshoe, by Grim of Postmortem Studios.

“There’s two separate things going on in these books. One is the presentation and ‘selling’ of the Gumshoe system, as a solution to a role-playing problem in pursuing investigations. The other is the presentation of Dave Allsop’s wickedly twisted imagination, which is as though Chris Morris was in a freak teleporter accident with Sean Hutson and a bag of genetically engineered cockroaches, only to materialise inside a David Lynch film.”

Dave Lai gives The Esoterrorists a positive review on RPG.NET, giving 4 out of 5 for both substance and style.

“Will this one be able to stand out from an apparently increasingly crowded genre? The short answer is a resounding ‘Yes”.”