When a mysterious illness infects citizens of Arkham, including their friend, Staci Clarke, Rex and Hannah race to discover a cure before it's too late.
This story makes references to events in the H.P. Lovecraft story The Colour Out Of Space.
Rex and Hannah return to Yuggoth, the dark planet, in this story.
Staci Clarke makes her fourth appearance in this story. We see her parents and older sister, Sarah, for the first time.
The ending of this story involves the real life news of the possible discovery of an unknown planet at the edge of the Solar System.