The title probably gives the game away, but this is a story about the horrors of a land well known to those who enjoy the works of H.P. Lovecraft. But the actual story itself is more of a prelude to the actual expedition.

It starts when a researcher decides to take a DNA test and discovers that a significant part of her own DNA is 'unknown'. Some digging reveals that another person may also have the same unknown DNA but attempts to personally meet the person fail, but in a rather inhuman way.