Here's the publisher's description:
Sophie and her friends face battles unlike anything they’ve seen before in this thrilling sixth book of the and bestselling Keeper of the Lost Cities series.
Sophie Foster is struggling. Grieving. Scrambling. But she knows one thing: she will not be defeated.
The Neverseen have had their victories—but the battle is far from over. It’s time to change tactics. Make sacrifices. Reexamine everything. Maybe even time for Sophie to trust her enemies.
All paths lead to Nightfall—an ominous door to an even more ominous place—and Sophie and her friends strike a dangerous bargain to get there. But nothing can prepare them for what they discover. The problems they’re facing stretch deep into their history. And with time running out, and mistakes catching up with them, Sophie and her allies must join forces in ways they never have before.
In this spectacular sixth book in the and bestselling Keeper of the Lost Cities series, Sophie must uncover the truth about the Lost Cities’ insidious past, before it repeats itself and changes reality.
I've been a fan of the Keeper of the Lost Cities series since before the third book came out; it's actually the reason I discovered MMGM (which was until recently run by Messenger) and joined it! This book has many of the same qualities that have made the rest of the series great. The characters are so true to their personalities and so layered that I literally could imagine meeting one of them in real life. Parts of the novel are deep and poignant (the struggles involving characters' families and friends make sure of that), while others are hilarious and break the tension (just flipping through the book, I found several amusing lines). This novel has a special emphasis on the relations between the world's different intelligent species: new members of the warlike ogres are introduced, and the history between the elves and humans is further explored (Nightfall itself plays a major part in this history). If I had one criticism of the novel, it would be that very few of the series's plot lines have been tied up, making the book seem slow at times. The seventh and final novel (unless Messenger extends the series again), Flashback, must now end the series properly without seeming disjointed. With all of the events that have occurred in this most recent book, however, I am still desperately excited to read the next book in the series, as any reader will be!