From the Chaosium website:
Three Cthulhu Dark Ages Convention Adventures
This monograph constitutes Chaosium's first GenCon tournament for Cthulhu Dark Ages. The staffers chose the Latin name, which translates to "the approaching darkness". It also makes for a nifty acronym that fits in well with the Lovecraft Mythos.
The first scenario, ‘Island of the Damned’, takes tough-as-nails Viking characters completely out of their element. Vikings were the scourge of the Dark Ages and here, predator becomes prey.
The second scenario, ‘Risam Vellere’, concerns early attempts at translating one of the forbidden tomes of the Mythos.
The third scenario, ‘The Innocent’, is the more human story of a victim of the Mythos who holds no culpability in his fate nor escape from his destiny.
A feature of this monograph are the prepared handouts, and the pre-generated Dark Ages investigators. This is a great way to give Cthulhu Dark Ages a try.