Am I right to trust you with my time?

So I'm a third of the way into Night Film right now and the book is huge, it weighs a ton. I bought it based on some buzz, some positive reviews and because I wanted to read something different and if you read the back cover, this book is definitely different, part murder mystery, part horror novel and part literary.

It started really strong, the writing is great, but as I read it, I'm a little nervous. I'm not completely assured at this point that the book is going to meet my expectations. Will the ending match the awesome beginning? I don't have that sense of calm that you get with some books that the author is utterly in control, she/he knows what you want and they are going to ensure you get it.
(I know how ridiculous that sounds) but think of your favourite authors and how assured their writing is. The first that comes to mind is Sherry Thomas, I rarely have doubts when I read her book, because there is a sense from the first page that she is absolutely in control and this book will deliver on the promise. Or maybe it's my experience with her and that's me talking for the author when I open her books?

My best example is on the many singing shows there are out there. When someone comes out and they're calm and confident and the first note is awesome, you're more likely to follow them through the remaining song, but it also makes it worse if the last third of the song is an off-key mess.

Or have I had too much coffee this morning? I'm really hoping that this book is great, because I really want it to be. I need a new literary obsession.