Sherlock Holmes vs. Cthulhu

A series of grisly murders rocks London, with victims reduced to bones and strange symbols left behind. Sherlock Holmes and Dr. Watson investigate, uncovering a connection to bizarre geometries that allow otherworldly creatures to enter our dimension. The books are linked by the ongoing threat of these creatures and the cult of the Old Ones, as well as the involvement of Holmes's nemesis, Moriarty.