Neuen is a planet of extremes, thanks to a crawling rotation rate. Nights of bitter cold. Days of searing heat. For Levi Zetmer and the other Reisende, survival means a nomadic existence chasing the ever-shifting twilight. Exiled from the polar cities for their "flawed" genetics, they live under constant surveillance, forced to cleanse their bloodlines birth by birth.

It's Lyn's job to keep them on track. A polar city denizen, she travels from Reisender settlement to settlement and monitors the genomes of the newborns. The work is lonely and tedious until all the inhabitants of a neighboring settlement mysteriously die, and Lyn is tasked with uncovering the cause of the deaths.

For the journey, she needs help from Reisende knowledgeable in plagues and blights. Levi's expertise in the latter earns him a place in her expedition. But all their efforts yield only questions, and whatever killed the others seems poised to wipe out Levi's settlement next.

Lyn is determined to find a solution. Levi is dead set on learning the truth. Together they just might be able to unravel the mystery. Will what they learn finally free the Reisende from their age-old shackles? Or will the truth break them?

Neuen is a science fiction mystery with aspects of botany and genetic engineering.