This is another excellent scenario from Stygian Fox and recommended for mature players. You really are going to have to check that everyone is ok with some of the themes here. Based on Finnish Folklore and connected to a particular Mythos Deity, there is a lot going on in the books 74 pages. There are plenty of options for players and for the keeper to expand on.
After the initial investigation stages, violence and mayhem can explode suddenly and unexpectedly and the scenario is best played by players with enough experience to know when to run... if they can! There is a lot of opportunity for role playing and each location gets progressively more eerie with the potential for the game to be very unsettling. The game will probably take about 3 nights to play through but there is room for it to take much longer, in fact this could be a great opener for a campaign. An expanded version of this scenario would be very welcome, and it is begging for a sequel. Highly recommended.