To be honest, I initially had low expectations, but the book somehow still disappointed me.
Firstly, the vibes are very different from the show. I expected the narration to depict the atmosphere of the Hargreeves' family, like keeping the humour, characters' personalities, etc. Nevertheless, unfortunately, I did not get the vibe or feel the characters. Some heroes act out of character; even Reginald does not seem like Reginald from the show. The author listed a few stereotypical characters' personalities and stuck to them instead of exploring them in more depth. Allison is not only a girl who rumours everyone, but her chapters are only about that. Why not show her from another perspective? To be honest, all characters get the same treatment except Ben. He was pretty complex here and was explored relatively better than the others. Maybe, because he was not explored well in the show. However, the characters' issues were generally overlooked and not mentioned. Their interactions are so dumb sometimes. For instance, Ben asks Allison whether it was that hard not to use her powers for one evening when he was pretty successful in not using his. Man, your powers are tentacles; of course, it will be easier for you not to use them in a party full of other people. What would you even use them for? A go-to party trick?
Additionally, I want to mention Allison and Luther… Why? Just why? You could easily get rid of this incest, and all of us would simply say thank you. Or you could mention it once, and we would move on. But no, every chapter from Luther's POV was filled with glances and thoughts about Allison. It was simply disturbing and disgusting. I wish we had the same energy in showing the real thoughts and personalities of the main characters, but whatever.
The narration is very abrupt and random. Some siblings in other siblings' POVs are simply forgotten and abandoned until they are either needed for something or until they are given the chapter from their POV. The narrator, in general, is also quite annoying and sometimes mentions many apparent facts. For example, the narrator, for some reason, explains that they do not wear the same uniform as they did when they were kids because they grew up, and the uniform is now tiny for them. Please, authors, stop making your readers look dumb; we know people grow out of clothes. And I would let it slide if there was only one moment like this, but there were so many, as well as the overuse of brackets with obvious information. Also, there was a lot of over-explanation. I assume the fans of the show would read this work. Thus, these over-descriptions were unnecessary since they just repeated information everyone already knew. However, at the same time, if one thinks that non-fans who have never seen the show read it, these explanations were not enough to fully understand the lore and background of the characters. There are also many repetitions. Once again, instead of showing and not telling, there were a lot of repetitions of the same takes. Yes, we know that Viktor never felt like he belonged to the Umbrella Academy; no need to mention it every time in his chapters. We could assume that simply by the description, not by directly mentioning the exact words every time.
It is crucial to mention the overall plot as well. The story is so dumb, the overall 'lesson 'is very primitive, and the plot twist in the end makes no sense either. The story chosen is disappointing and is not canon. Why did the siblings never acknowledge it in the show, then? The events that happened are pretty crucial for the plot. They suddenly saw kids like them, when in the show they never even mentioned seeing them before Laila. Even though I try not to care about plot holes and primitive plot twists because it is fiction, and the show itself has many plot holes, it was even more annoying here. How did no one at the party know them? They are super popular. Of course, teenagers in a university from the same city would know the Umbrella Academy. They were even telling their real names. Did nothing ring the bell? Okay, let's assume they were pretending not to know who the siblings were, but how did the siblings not think about coming up with fake names at least? Or how they did not find it weird that no one recognises them? The book made me have 1000 questions.
Also, there were a lot of factual mistakes. I do not want to mention all of them, but for example, let's look at the quote from when the narrator was describing the sibling's superpowers: 'Diego could wield knives with extraordinary precision'. We all thought so during the first season, but season 2 and the others showed that his power is much more than just throwing knives. Also, Diego's powers, in general, were not explored; Viktor was listing how siblings could use their powers in any sphere and then about Diego, he said, 'he could be a world-class chief'. Excuse me, but how is it even connected? Did not know that chiefs throw knives at food to get it done.
All in all, I felt like I read mediocre fanfiction rather than official content. I guess many fans would want to read it, especially after the show's ending, but to be honest, fans' speculations about the teenage characters that I saw were more interesting than this. Plus, this novel was very poorly written and edited. I spotted so many mistakes that are inadmissible in a published novel. A very weak work with a very weak story.