This book will cost you 1d6 SAN. You have Sherlock Holmes and related characters, the poster children for reason, thrust into the world of Lovecraft, where irrationality and things beyond reason rule. You really cannot reconcile the two; the things that go bump in the cosmos win, and it’s ultimately not comforting.
As a collection of short stories written by different authors using the same characters, the different treatments are jarring. In one, Holmes and Watson are action heroes, for crying out loud, having a shootout in the London sewers with a bad guy carrying an unmounted Gatling gun. That would have been kinda heavy, don’t you think?
Still, the book is worth a couple of bucks for the concept and the better stories, but ultimately, it’s not good Holmes and it’s not good Lovecraft.