What to expect 
 This was not as good as Angelology. It feels rushed at some points and the confusion makes many parts tedious up to about halfway through, where it picked up for me. The stories weaving the nephilim and history/biblical lore are much less believable and the novelty of the first book seems to have almost worn off. 
 Trope Check 
 *angels 
 *everyone important is white 
 *special beings thing 
 *elixir of immortality 
 Accuracy check 
 This did a decent job with Imperial Russian history itself, but the weaving of the last Russian Imperial family and the nephilim is much messier than when Trussoni works with biblical lore and has much more leeway. One issue, for instance, and a common one in fiction, is the names. Vera's surname is Varvara, which is actually a first name and those are not interchangable. In addition, she refers to Grand Duke Michael as Grand Duke Michael II. Grand dukes' names are not numbered, otherwise Nicholas's cousin Alexander Mikhailovich may well have been Grand Duke Alexander XVII and that would be a pain. 
 As someone who reads a lot about the Nicholas II and his family, I can't imagine people as devout (or "devout" depending on your opinion) as them being Nephilim, who are against organized religion in general (according to book one) and have less compassion and stuff. 
 Also, the way the last Russian imperial family is described here is sometimes a bit laughable and historical purists would be all over this with red pens. 
 Alix, as she was called by her husband, was extremely proud of her inheritance and her gifts. She spent hours and hours grooming her great pink wings. She would use her leisure time teaching her daughters to fly in the private garden of their country estate in the Crimea 
 These things? On her? 
 Like, I get there's the "it's fiction" thing going on, but the last imperial Romanovs are an extremely sensitive topic. They were indeed brutally murdered and much later canonized for their suffering by the Russian Orthodox Church. Such treatment of people such as them in fiction is often considered disrespectful. 
 The Verdict 
 Not bad, but it takes a while to pick up. Nevertheless, it still retains some of the qualities of Angelology, so I enjoyed the latter half of this.