Fifteen escaped and found their way to freedom, but Book, Hope, and Cat can’t settle into their new life knowing the rest of the Less Thans and Sisters are still imprisoned. Now the teens must retrace their steps to save the others and thwart the Republic’s dark plans to destroy those deemed different, even as relationships are tested and the path back is filled with danger. With new enemies lurking, the group must put their fate in the hands of unexpected allies, and must ask themselves how far they’re willing to go to free their friends.