This book should be titled, "The Big Book of Narrative Cheats," because holy moly, between psychic bonds, dream walking, flashbacks which exist simply to keep the Rose-Dimitri lovefest going when the narrative won't allow it, and whatever is is that Oksana can do, there's a ridiculous setup that moves along the plot. 
 While I enjoyed the first three books in this series, despite the godawful writing, this one bored the crap out of me. All of the big reveals were wholly predictable and there was something missing in Rose's perspective that was present in the first three books. 
 Wondering if I can skip book five and move onto the last... Because I can't deal with the thing that Rose is angsting about at the moment--it's a snoozefest--and I understand it continues in the 5th book.