The issue with stories that rely on the reader being uncertain about what is going on and mind-blowing twists is that they fall completely flat if the reader connects the dots early on. 
Everyone was saying that it's okay not to know what is going on for the first half of "The Last House on Needless Street" because you're not supposed to know. 
The issue for me, however, is that I did know what was going on. 

I actually felt it was really obvious from close to the beginning and everything else that followed went towards reinforcing it. And I have to say, I wasn't impressed. 
Not only is the story arguably founded on one of the oldest and most cliched tropes, but it's also insensitive as all heck to the marginalised community that the author chose to exploit for her novel. I don't care that she lists her research at the back of the book. 

Basically, she wanted to be considerate of such people but just not to the point of not exploiting them and their condition for her book and to make some money. That makes it even worse somehow. The only thing I will say is, I am glad they flipped it slightly so that the person in question wasn't a 'bad guy' since that's how the trope generally plays out.

Some of the smaller twists were nice but not completely unexpected either. This is probably a book I would enjoy more on reread since there's no longer an expectation of being deceived or surprised, and no disappointment when it doesn't eventuate, but the trope is old and in this day and age, authors have no excuse not to do better when it comes to using marginalised groups like this.

This book wasn't for me.