A Dark Matter by Peter Straub

Peter Straub's A Dark Matter takes the setup that Stephen King turned into a horror trope: a group of friends face unspeakable horror as young 'uns then reconvene when they're old and damaged to finally defeat that unspeakable horror. Only Straub smartly plays it without the rematch. A Dark Matter isn't the coming of age take as described above, it's about age itself, and the events and people who shape us.

Lee the narrator is a middle-aged man, best selling novelist married to another Lee (...