Very typical Neil Gaman.
5 stars
As I was reading this novel, I was pretty sure that the narrator was actually a version of @neilhimself@mastodon.social. The acknowledgement seems to acknowledge this.
The story follows a man in his forties, remembering a fantastic event from his childhood. Most of the novel follows this story, with the main character being a bookish seven year old boy with few friends, who gets trapped in a fight with beings from another reality.
A lot of the story is a commentary on memory, and for some time while reading, I thought that perhaps the entire fantasy story was a memory concocted by the narrator to cope with the shock of discovering his father's infidelity.
It's a quick read and very enjoyable. It would be appropriate for older children, but just as enjoyable for adults.