A brilliant, exciting and unique campaign set wholly in the uk, with it almost exclusively in the city of London with one foray into a London suburb. Involving ancient world entities, linked to the mythos,Mathis is one roller coaster campaign that does have both investigation and action. It could work well as a pulp campaign. I think it's almost mandatory that you have the excellent Cthulhu Britannica London sourcebook as this will enrich the experience no end. Probably would work well with the more inexperienced player but is a challenge even for hardy investigators. A truly horrific Climax makes for a campaign that won't be forgotten. ( )