I started reading it at 11pm, thought I'd get a couple of chapters in then go to sleep. Kept on reading and it got to 2am. Then 3 and so on. Read the lot by 7am
Dp work's night shift and I texted him to tell him I hadn't slept but it was self induced. He couldn't believe it, staying up out of choice? 
What a gripping read, totally absorbing. The two main characters weren't all that likeable which makes a change, you usually like one of them. I suppose of the two I'd warmed to him and of course her before I 'knew'.
I've recommended it to everyone I've spoken to today, and on FB. I doubt anyone will be quite as keen to finish it as me? 