The Daylight War by
Peter V. BrettJust a heads up: this review will contain some spoilers for the previous two books in the Demon Cycle series, but I would assume if you haven't read them already you wouldn't have made it this far to the third installment.
The nightly battle against the demons of the core continues in The Daylight War. With the appearance of the more intelligent mind demons and their mimics from the last book, humanity now prepares for the new moon when the powerful Princes will return again with their hordes rising in full force. It's been a long time since I read The Desert Spear, but it appears this book picks up right where the last one left off, or at least very close to it.