Neuropath

Holy shit. This book will be on my mind for a very long time.

1) because its ideas are utterly fascinating and call into question everything we think we know about the human consciousness. This book genuinely makes you contemplate your everyday experience as a human being.
2) because it's absolutely horrifying stuff. It's incredibly dark and some scenes and descriptions will probably haunt me forever. 

This book is so effective because it's also fucking great at making you care about the characters. There's some genuinely loveable characters here that feel like real people. So you cannot turn away and really worry for their well being. The suspense due to that is incredible. I could not put this book down. 
This also meant that there were some dramatic moments that really hit hard. I got genuinely emotional and really felt affected which I didn't expect. 

All of that makes this a 5 star read for me.