The movie is better than the book which is a surprising feat.
The book starts off well, I liked the slightly different plot and the mystery but as the story went on the rumination over the same memories become mundane. I have not read the other two yet but it feels cheap to not ever really discover the reason or what Area X is. I felt a little frustrated with the ending & the way it wrote about the mutations "it was but it wasn't, it was blue but it was green it was this but it was that" I get that it's a hard concept to describe with words but so many aspects it felt like lazy writing saying "i read this or did this and i can't write it down, or i can't explain it" I do get it's meant to be a journal and there's only limited knowledge the biologist would have but it felt lazy to not write additional information the character had found. Everything felt it lacked depth and description, all the characters, the plot and the environment which is meant to be the most important part. Also some scenes were very obviously a man writing a woman's perspective and felt a little 2D or unrealistic including the characters emotional depth and the complete 180 about her husband.
It was good but i probably wouldn't recommend to anyone. The movie did an amazing job and I thought the book would have more detail but it didn't. It's a short book too it very easily could have more details. Also the over use of certain words started driving me a little mad. It had a plot with the tower but it just went no where. a frustrating read 2.5/5 but i'll give it 3 stars because it's the source to my favourite film