The book can go several different direction between Rose-Dimitri-Adrian, but there are some heavy duty clues as to what will eventually happen based on the fortune tellers predictions. This is my theory of the next book.
Rose won’t escape out of jail right away, not for at least a couple of chapters. Abe will ask about the note in private. He is aware of the files on Lissa’s father and reason why someone was looking into his past. Dimitri noticed the note being passed to her in the court by Ambrose. He’ll find a way to talk to her, perhaps use Mikhail’s help. She’ll learn more about Abe’s past and bad reputation.
I believe Adrian called Abe to help her out. He knows there is a snowball of chance she’ll be exonerated. His family will sell her out to make sure he looks good. (Alter evidence like the time he actually came to her.) He’ll visit her in his dreams, so they can talk in private while in jail. She’ll tell him about Lissa’s half-sibling. He’ll help look into Lissa’s sibling too.
Dimitri and Rose’s relationship will continue to be confusing. He’ll keep up his guard and act like he is helping out of honor. However, he’ll have moments that reveal his true feelings, but he’ll squash it. She’ll be confused as to his motive to help her, since he told her so many times to go away and that his love faded. Adrian will be a touchy subject between them (The fact she almost slept with Adrian will be an issue) She’ll be confused about her feelings for Adrian as well.
Abe will arrange for her to break out of jail, not sure if Dimitri will end up helping out, since he does know her father. She will go on a journey with Abe to Las Vegas to figure out who Lissa’s half-sibling. She may see Victor again, but he’ll want to help Lissa, believes she'll continue what he started. People will be after her to stop what she’s doing and bring her back to jail. She’ll go to Minnesota to get Jill, Lissa’s half-sister and go back to court. (Adrian may show up, but he’ll be followed by the guardians). Dimitri may go with her, but that could mean sacrificing ever being a Guardian again.
All along Lissa stays and fights with the royal families over her denied vote due to the quorum law. Tasha will push her agenda with Lissa. Adrian’s family will pressure him to live up to his family and he’ll start to crumble. Drink more and smoke.
When Rose gets back, she’ll be put on trial and proved innocent with Lissa’s vote.
They’ll find out one of the Royal family members killed Queen Tatiana. Someone was trying to stop Tatiana helping Lisa gain her vote in the court or push Lissa to becoming the next Queen. Rose will be assigned to the court guards. Adrian will leave. He can’t handle being with his family and pressure of living on the court. Their relationship will end. Dimitri will stay at the court as well. Whether Rose and Dimitri live happily ever after, not sure. But I hope so.