This picks right up where book 3 (Death Defying) left off with the Blood Hunter going into the black hole to escape their pursuers. They find another world, an alternate/parallel universe. However, things aren't as they seem,
Saffira has spent her life being told she is the one who will save her people. She is a "time-mancer." She also happens to be the strongest "time-mancer" and can see the past/future. She is very sheltered and naive. I found her annoying.
Devlin (met him in previous book) is the leader of the rebellion. He is hell bent on revenge for the murder of his brother. I thought he was an asshole for most of the book and when he came around, it was too late for me.
I was disappointed in this one. What was a good sci-fi romance got boggled down with the time travel element. I would have liked more on the world they landed on. Then, there's the "Old Ones." I didn't like how they only "changed" the men. Women need not apply. Sexist much?
Not sure if I will read the next.