Expiation is the fourth and final book in Drew Wagar’s acclaimed SF series, the ‘Shadeward Saga.’
Set on a tidally locked world in orbit about Lacaille 9352, this series is a blend of hard science fiction, post apocalyptic and fantasy genres in a plausible yet alien setting.
Shadeward book 4 is currently being written. You can follow progress here.
The book is due for release in early 2020.