Published: September 2017 - Dutton Books for Young Readers.
Genres: Young adult / thriller / contemporary mystery / romance / horror
Pages: 289.
Triggers/Content Advisory: Infrequent bad language, non-explicit sex scenes and sexual innuendo, strong violence and gore.
Format: Paperback.
Source: Thank you so much to Pan Macmillan SA for sending me an ARC of this book in exchange for an honest review.  

One-by-one, the students of Osborne High are dying in a series of gruesome murders, each with increasing and grotesque flair. As the terror grows closer and the hunt intensifies for the killer, the dark secrets among them must finally be confronted.

I have never read Perkins before. I know a lot of people are curious to read this book because it's so different from the fluffy contemporaries she usually writes, but I'm none the wiser. I basically just wanted to read this book because the cover is so absolutely gorgeous. AND IT REALLY IS, ISN'T IT?!

This is such a creepy book. There is a ton of crackling tension from start to finish and the foreshadowing is excellent. Right from the first chapter you can feel the dark anticipation, and the hints strewn along the way are perfectly subtle and suspenseful.
I also stupidly decided to read most of the book at night, which wasn't the brightest thing to do because it is terrifying; freaky, creepy, and very scary. But if you buy one book this Halloween season, make sure it's this one. It's the perfect seasonal read.

The dialogue is awesome. It's quick-witted, entertaining, and gorgeously razor-sharp. I love the vocal interactions between all the characters and their voices come through clearly.
The atmosphere is definitely the best thing about this novel. It's so creepy and atmospheric, and the dark, almost 'Little House on the Prairie' vibes are fantastic. The town's ramshackle, ghostlike, and the cornfields, dusky rural tones and empty roads all add to that chilling atmosphere. This book has the perfect setting for the story it's telling.

The horror is closer than you think.

The story is tense, dark, and gory. I also love that the action is relentless and twisty, but I do think it's very unrealistic in parts. For example, the killer ending (pun intended) is definitely hectic and riveting, but I struggled to suspend disbelief. It works because it's well written, but I doubt that in real life the kids could be so involved and the cops so pathetic and useless. And seriously, the cops in this town deserve to be fired. They don't do their job well at all.
I enjoyed the ending. But I still think the action goes on for a bit too long and the way everyone's involved is a bit unrealistic.

I'm happy to say I didn't guess the identity of the killer. The mystery's unusual and clever, and I really like the continual depth to the killer's motives. But there's still something about the murderer's identity that feels 'off'. I think I would've preferred the killer's character to have been central to the story before he/she is revealed to be the killer, and I think Perkins should've hinted at his/her identity more. She hides him/her too well for us to actually have a chance at guessing correctly.

Another story related issue is the 'big secret' Makani's hiding from everyone. Without giving spoilers, I don't think the 'big bad thing' she did was such a 'big bad thing'. Perkins should've chosen something a bit more shocking and darker than the incident she went with, and perhaps something that's harder to come back from. I wish Makani's secret was more 'unforgivable'. 

Makani stopped thrashing. She was trapped, imprisoned even, in this miserable town where she hated everything and everyone. Especially herself.

The characters are unlike any characters I've ever read about. The level of diversity is fantastic (there are characters of all different races and sexualities) and the variety of people is absolutely awesome. I love, love the uniqueness of every person and how compelling and fascinating everyone is. They're all so unique, unusual and vivid.
But Alex and Grandma Young are my favourite characters. Grandma Young is so fierce, loving, capable and opinionated, and Alex is equally individualistic and full of attitude. She's just one of those characters I instantly fall in love with, and both of them are so wonderfully written.

Unfortunately I don't like the romance. It's entirely personal preference, but as I don't like Ollie's character I can't like him with Makani. Their relationship is compelling, but Ollie is creepy.   

There's Someone Inside Your House is a creepy, atmospheric horror thriller with incredibly unique characters and tons of tension and wit. There are a few aspects I'm not sold on, but overall it's the perfect Halloween read and lots of dark fun.