I have seen people saying that you get enough information on Levana's past through just reading it in Winter but I disagree. In Winter it mentions her previous husband, but it does not explain how incredibly fucked up Levana actually is. 
 I think that this story is very good to read; it was interesting to get a new view on Levana and why she is the way she is, but I am unsure if this is quite enough! It skips well over sections which would have been interesting to read about ... To be honest, I think this could have successfully been a whole novel (I mean, I would have read it). 
 Levana is like crazy evil. In some places, it seemed like Meyer was trying to make her seem sympathetic to a small extent, and it did not really work for me and was almost a bit annoying. It's fine to just have a character who's an evil bitch, you know? Because she is truly evil and insane, and I don't feel any sympathy for her at all. 
 These are some of the examples of Levana being fucked up / reasons why she is fucked up: 
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 So she falls in love with this guy who has a wife who dies in childbirth (WINTER is the child!). And she tries to seduce him by glamouring herself to look like a prettier version of his wife ... and glamouring him to actually be attracted to her. At one (many) points she basically rapes him. And forces him to marry her. 
 After years of this horrendously creepy marriage, she shows him under her glamour - her real burned appearance - and then she hires a Thurmataurge to kill him? Some weird kind of pretence where he sneaks into their bedroom and it looks like he was trying to assassinate her as well ... and she also ends up killing the Thurmataurge too. 
 Her real burned appearance is caused by her equally evil sister, Channary, who pushes her fully into the fire when Levana accidentally burns her when she was trying to get away from her. 
 This also shows what Levana did in the terms of the 'army' of wolf-men and also the Leutomis (?) virus. I honestly cannot remember so much what she did in particular, but I know that it was bad, and I know that it was evil and insane, as usual for Levana. 
 There was also the 'murder' of Selene. She makes herself totally suspicious by going to pick up Winter herself randomly through the day, which is dumb and is strangely out of character seeming for her, as well as the fact that she would even bother to save Winter first, to be honest. The fact that she'd choose fire when the same has happened to her is scary and not really explained satisfactorily which is a shame. 
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 It was very good! I just wish there was MORE and did not skip so much, as it would have been interesting to see more of the sick and twisted and generally insane things that she and her family did, e.g. (view spoiler)[ the dressmaker who had her feet cut off was only passingly mentioned, like what happened to her? Also, the mutilation and treatment of little Winter was not shown (neither was it in Winter itself. Was it done calculatedly, or in a jealous rage? (hide spoiler)] I also wish that Meyer had not tried to make Levana sympathetic. For me, it didn't work.