This mini-campaign is set in November 1941 and takes the Investigators from the dusty streets of Arkham ultimately to a small island in the South Pacific called Spider Island. While it is made up of several chapters these aren't stand-alone scenarios but part of an overall larger-scale adventure.
While World War II rages half way across the world, in sleepy Arkham a new "extra-curricular club" has been founded to investigate the strange and unexplained. The Investigators are invited to join this society which takes its name from the student bar in which it meets, "The Witching Hour." But, unbeknownst to them the eccentric figure who founded The Fellowship of the Witching Hour -- Professor Arzt Kreuger -- has a distinct agenda which he has 'recruited' a group to pursue on his behalf. Through a variety of manipulations, Kreuger steers the Investigators (and other Non-Player members of the society) to track down an old foe and thwart their evil scheme.
Kreuger's enemy is a brutish SS thug called Wolfgang Rabe (nicknamed The Raven). Rabe tortured Kreuger back in Germany because the latter discovered an occult organisation active in Munich which is deeply connected with Hitler and the German Government. Arzt fled to America (and eventually to Arkham) a year ago to escape the Nazis; more recently Rabe has also entered the country, although his motives are unclear. The Professor believes he has some kind of occult evil planned for Arkham and has formed the Fellowship as a means to investigate Rabe without revealing himself to the brutish man.
At one of the first meetings of the Fellowship, all members arrive to find that Arzt Kreuger is not present, purportedly ill. But he has left a note inviting the members to attend on him at his home, Greyfriar House about 5 miles from Arkham. The twist is that Greyfriar House is not actually Kreuger's home but the house currently occupied by Rabe and his Nazi retinue. After some confusion, the Investigators have the opportunity to explore the mansion, finding that it has its own intriguing history. In the 1890s the house belonged to a globe-trotting import/export tycoon named Albrecht Zubriggen whose voyages brought him into contact with South Pacific islanders who practiced a primative worship of a Mythos entity. In the midst of their investigation of the house, Kreuger re-appears ostensibly to help but also to direct them to witness an occult ritual that Rabe performs in the cellar. While the ritual doesn't succeed and most of the Nazi's (including Rabe) escape, it reveals clues pointing to the specific Pacific island where Zubriggen first encountered the Mythos worshipping natives.
The final section of the campaign concerns the Investigator's long voyage to the Island of the Spider (near Bora Bora in French Polynesia), in pursuit of The Raven. The Nazis travel by U-Boat (on which Kreuzer has stowed away); the likely route for the Investigators is a series of long charter flights. During the trip they witness the Japanese attack on Pearl Harbor. Ultimately the trail leads to a large volcanic island which still has the Zubriggen plantation buildings. Beneath these still stands a terrible temple (again constructed by the tycoon) where the climax of the scenario occurs as Atlach Nacha makes a personal appearance.
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