This was a very quick read. It drew me in immediately and I flew through the first quarter. The atmosphere was creepy and rubbed me the wrong way, in the right way.
I loved the development of the relationship between John and Daniel. I liked the over arching plot. I devoured the final quarter.

But it lost me a bit in the middle. The plot progressed steadily, but the John/Daniel narratives sometimes felt a bit repetitive. John's narratives were repetitive in the self-worth, self-criticism aspect. Dan's narratives sometimes covered elements that John's either already had or would go on to explain.
I just found myself skipping over some of Dan's internal I-hear-possible-dead-people conversations and John's pity parties.

But as an overall, I thought it was a good read.

Alex North excels at creepy books, he really does.
This one though, it hits differently.
I felt uncomfortable for a lot of it (in an Im-enjoying-this way) and a sense of dread too.
But also it brought out a few other emotions, for that boy, that father/son relationship.
There were a few surprises along the way , and the plot was paced so well.
It was really rather good.
Since the Whisper man, North has been an autobuy author for me, but he seems to be getting better and better.