So, this book ended on the craziest cliffhanger of the entire series to date. Richelle Mead leaves us with very little clues as to who could have killed Queen Tatiana. So I have devised a few of my own theories. 
First of all, I don't think Victor killed the Queen. Why? Because he's been locked away for months and, like most convicts, probably has a new appreciation for freedom. Not only that but Rose didn't go after him in Las Vegas when he got away, making him realize he is truly free, at least for now. He also is in cohorts with his brother, Robert, who I can guess would try and talk him out of any scheming he might try and do especially if it involves Victor's freedom being revoked or having to be around other Moroi/dhampir. Aside from all that, Victor is the most obvious suspect, which would make for a rather pathetic mystery. 

Personally, I'm thinking Ambrose did it. He was close to the Queen. Trusted even. And in the book, once he finds Rose, he mentions having gone by her room to look for her (i.e. the perfect opportunity to steal her silver stake). He also gives Rose a note from the Queen just as Rose is leaving the courtroom, proving that he has had to have seen her recently. At least within 24 hours. What we do know about Ambrose is that he's a dhampir, probably trained in how to properly use a stake and to stake a Strigoi. But since he didn't become a guardian, no one can be sure. If you ask me, I think his character is clouded in mystery. We don't know much about him. I, myself, write stories and aspire to be an author. And at one time, I wanted to be a detective. Given those two qualities, I know how to weave a compelling tale, as well as figure out who the guilty party is most of the time. Though Ambrose's motive is uncertain, there is enough probable cause for me to consider him a suspect. 

I am also suspicious of Adrian's father, Nathan. The Queen made a grand show of insulting him in his own home. He also shows blatant dislike for Rose. If he killed Tatiana, he could rid his son of Rose and rid the Moroi society of the Queen. He has motive, certainly, but unfortunately lacks probable cause. 

I have tried racking my brain for other suspects as well but none are set in stone. I believe whoever killed the Queen, witnessed or heard news of the common abhorrence between her and Rose and simply used it to their advantage. Whether or not that person has a grudge against Rose is unfounded. Rose could simply be an unfortunate casuality in someone's sinister plot to assasinate the Queen. Anyone could have killed her with enough motive.  

I'd like to hear more theories though. Any takers?

Seriosolly this is one of those mysterious were I have no idea!! And am so confused I think it's gonna be a person we don't expect! And what motive would it give to victor. I mean rose bailed him out it could be Ambrose but why tho?

? Far- wetched...or worth giving this theory a thought???
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It's quite possible. However, I still think Ambrose did it. Something about him is just off, to me at least. I am curious as to who Lissa's half-sibling is though. It would be kind of funny if it turned out to be Jill!

o.o so i guess ambrose is the big question right now.

Yes. I can't shake my suspicion of him for some reason. But I suppose only time will tell if he is guilty or innocent. The Queen's death was an inside job, I think. Someone close to her killed her. I was pondering about Daniella having killed her. She's another possibility. Maybe she hated the Queen and disliked Rose and found the oppurtunity to get rid of them both. She is family to Tatiana, albeit through marriage.

Yeah i know it wouldve been a good reason and to frame rose gah idk,,,

One of my theories is that ambrose might have done it. he was trained to be a gaurdian and probably taught how to use a stake too. and he probably could've gotten those records for the queen too. but there is a flaw in my theorie in fact probably many. ambrose loved his queen which makes me rethink the part in which he would've been the one to kill her. and i twould have been easy for him to do it and get rose's stake for it too i mean the gaurds wouldn't question someone the queen was likely to be "infatuated" with. but why would he? that's the question.

any opinion's?

maybe they got in a fight? or he cheated and she was mad or something?

I think it might have been Ambrose's aunt, or whoever she was... the fortune teller. She never really liked Rose, because she didn't belive in the cards, and maybe she found out about Ambrose/the queen's "relationship". Or maybe the queen killed herself! I mean, she never really liked Rose, although she did give her that note, and maybe she killed herself to get Rose in troiuble, and give her a chance to read the note. It could be one of the guardians that didnt like Rose. I don't know. All I know for sure is that it won't be Victor. He has no motivation anymore, now that he's free, and that would just make a terrible story.

I mean, it could be anyone for all we know. I think that there's a very real possibility that Eric Dragomir's illigitamte child or girlfriend could have done it. Maybe the girlfriend lives at the court or something. We don't really know enough yet to be making any conclusions.

i think that it would of been daniella, adrian's mum. as she was really anxious when she found out that adrian was with rose that night. i also think that it could because she was too nice to rose. also i think that it could of been adrian, i just find it that he was way too nice when he went to visit her that night.

my sister thinks it could be tasha as she hated the queen and what they were doing to stop her from using her powers for defensive measures.

Thank you, In_Love_With_Belikov83, for agreeing with my theory! I appreciate the support...Also about Ambrose being the murder...I really don't think so...first, it's too cliche and Mead won't write something so generic. Also, if we believe that Tatiana was actually the one who wrote the note, then we can also assume she knew she was in danger. it was mentioned in the note that if she (Rose) was recieving this note, then something bad had happened. And it sounded like Tatiana had written that note because she knew she was in danger, but she had to complete the task she was not able to, perhaps finding the illegitimate Dragomir child, and wrote it lest she was not able to finish it.
However, Ambrose had to know something. The Queen clearly trusted him, she would have told him something, anything.
And, honestly, yes, Daniella was nice to Rose, but I think it was more because she saw the change in Adrian brought on because of Rose(being sober)and was happy about it.

All i think, is if the queen was murdered there is only one person who would set it up.. the queen herself. I really believed the queen planned her murder. But, i guess the question remains who did the actually staking. I personally support the Ambrose theory. But, he did it out of love, not hate or anything.

The Queen killing herself?? Dude, she seemed like the kind who could pay somebody to kill for her. not kill herself. There's no motive, no ability to stab herself, and write a note to Rose saying that she needs to do something for her, giving it to Ambrose only if something "terrible" has happened to her??? Not to mention using Rose's stake would put suspicion on her, and Tatiana would ask for her help while she knows Rose's in jail???

I'm sorry if I sound harsh, but this theory goes way over my head, but maybe that was your reaction to my theories as well. However, I do know it's what you think, and I would like to know more about it. Also, what is your opinion to these questions??