Red Eye of Azathoth (2011)

From the publisher:

All men fear the Harbinger Star. Kings die and nations crumble when the red comet takes the sky, and madness trails in its fiery wake. But those versed in that rarest of occult lore know the Harbinger Star by its true name: The Red Eye of Azathoth.

This series of linked scenarios circles around a returning comet and horrors it brings, this adventure series is set in historical periods, from the Viking and Samurai era right up to the Inquisition, the lost colony of Roanoke, and the Wild West.

Five linked Call of Cthulhu adventures by Chad Bowser, Tim and Eileen Connors, Andi Newton, Ted Reed, and Michael Furlanetto to make even strong investigators tremble!

The softcover version was released as a POD to patrons of the project. It was only available for about a week.